diff --git a/xamarin-android-toc.html b/xamarin-android-toc.html
index 9f07d890..8f971097 100644
--- a/xamarin-android-toc.html
+++ b/xamarin-android-toc.html
@@ -9,7 +9,7 @@
     <li>
         Installation and Upgrade
         <ul>
-		    <li><a href="/xamarin-android/installation-and-upgrade/system-requirements">System Requirements</a></li>
+		    <li><a href="/xamarin-android/Introduction/System-Requirements">System Requirements</a></li>
             <li><a href="/xamarin-android/installation-and-upgrade/download">Download</a></li>
             <li><a href="/xamarin-android/installation-and-upgrade/install-using-the-web-installer">Install using the Web Installer</a></li>
             <li><a href="/xamarin-android/installation-and-upgrade/install-using-the-offline-installer">Install using the Offline Installer</a></li>
@@ -457,6 +457,7 @@
             <li><a href="/xamarin-android/sfpdfviewer/FreeText-Annotation">Free text annotations</a></li>
             <li><a href="/xamarin-android/sfpdfviewer/Textmarkup">Text markup annotations</a></li>
             <li><a href="/xamarin-android/sfpdfviewer/Bookmark-Navigation">Bookmark Navigation</a></li>
+            <li><a href="/xamarin-android/sfpdfviewer/Working-with-PDF-Coordinates">Working with PDF coordinates</a></li>
             <li><a href="/xamarin-android/sfpdfviewer/Working-with-PDF-AcroForms">Working with PDF forms</a></li>
             <li><a href="/xamarin-android/sfpdfviewer/Working-with-Scrollhead">Working with ScrollHead</a></li>
             <li><a href="/xamarin-android/sfpdfviewer/Localization">Localization</a></li>
@@ -790,7 +791,7 @@
     </li>
     <li>
         Release Notes
-        <ul><li>2021 Volume 4 - v19.4.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.4.0.56">v19.4.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.55">v19.4.0.55</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.54">v19.4.0.54</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.53">v19.4.0.53</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.52">v19.4.0.52</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.50">v19.4.0.50</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.47">v19.4.0.47</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.43">v19.4.0.43</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.42">v19.4.0.42</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.41">v19.4.0.41</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.40">v19.4.0.40</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.4.0.48">v19.4.0.48 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.38">v19.4.0.38 Main Release</a></li></ul></li><li>2021 volume 3 - v19.3.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.3.0.57">v19.3.0.57</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.56">v19.3.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.55">v19.3.0.55</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.54">v19.3.0.54</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.48">v19.3.0.48</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.47">v19.3.0.47</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.46">v19.3.0.46</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.45">v19.3.0.45</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.44">v19.3.0.44</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.3.0.53">v19.3.0.53 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.43">v19.3.0.43 Main Release</a></li></ul></li><li>2021 Volume 2 - v19.2.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.2.0.62">v19.2.0.62</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.60">v19.2.0.60</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.59">v19.2.0.59</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.57">v19.2.0.57</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.56">v19.2.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.51">v19.2.0.51</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.49">v19.2.0.49</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.48">v19.2.0.48</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.47">v19.2.0.47</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.46">v19.2.0.46</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.2.0.55">v19.2.0.55 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.44">v19.2.0.44 Main Release </a></li></ul></li><li>2021 Volume 1 - v19.1.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.1.0.64">v19.1.0.64</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.59">v19.1.0.59</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.58">v19.1.0.58</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.57">v19.1.0.57</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.56">v19.1.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.55">v19.1.0.55</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.1.0.63">v19.1.0.63 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.54">v19.1.0.54 Main release</a></li></ul></li><li>2020 Volume 4 - v18.4.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.4.0.49">v18.4.0.49</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.48">v18.4.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.47">v18.4.0.47</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.46">v18.4.0.46</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.44">v18.4.0.44</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.43">v18.4.0.43</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.42">v18.4.0.42</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.41">v18.4.0.41</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.35">v18.4.0.35</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.34">v18.4.0.34</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.33">v18.4.0.33</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.32">v18.4.0.32</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.31">v18.4.0.31</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.4.0.39">v18.4.0.39 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.30">v18.4.0.30 Main Release</a></li></ul></li><li>2020 Volume 3  - v18.3.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.3.0.53">v18.3.0.53</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.52">v18.3.0.52</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.51">v18.3.0.51</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.50">v18.3.0.50</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.48">v18.3.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.44">v18.3.0.44</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.42">v18.3.0.42</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.40">v18.3.0.40</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.38">v18.3.0.38</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.3.0.47">v18.3.0.47 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.35">v18.3.0.35 Main release</a></li></ul></li><li>2020 Volume 2 - v18.2.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.2.0.59">v18.2.0.59</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.58">v18.2.0.58</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.57">v18.2.0.57</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.56">v18.2.0.56</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.55">v18.2.0.55</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.54">v18.2.0.54</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.48">v18.2.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.47">v18.2.0.47</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.46">v18.2.0.46</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.45">v18.2.0.45</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.2.0.44">v18.2.0.44 Main Release</a></li></ul></li><li>2020 Volume 1 - v18.1.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.1.0.56">v18.1.0.56</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.55">v18.1.0.55</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.54">v18.1.0.54</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.53">v18.1.0.53</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.48">v18.1.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.46">v18.1.0.46</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.45">v18.1.0.45</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.44">v18.1.0.44</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.43">v18.1.0.43</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.1.0.52">v18.1.0.52 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.42">v18.1.0.42 Main Release</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.36">v18.1.0.36 Beta Release</a></li></ul></li><li>2019 Volume 4 - v17.4.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v17.4.0.55">v17.4.0.55</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.53">v17.4.0.53</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.51">v17.4.0.51</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.50">v17.4.0.50</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.49">v17.4.0.49</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.47">v17.4.0.47</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.44">v17.4.0.44</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.43">v17.4.0.43</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.41">v17.4.0.41</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.40">v17.4.0.40</a></li></ul></li><li><a href="/xamarin-android/release-notes/v17.4.0.46">v17.4.0.46 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.39">v17.4.0.39 Main Release</a></li></ul></li>
+        <ul><li>2022 volume 1 - v20.1.0.*<ul><li><a href="/xamarin-android/release-notes/v20.1.0.47">v20.1.0.47 Main Release</a></li></ul></li><li>2021 Volume 4 - v19.4.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.4.0.56">v19.4.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.55">v19.4.0.55</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.54">v19.4.0.54</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.53">v19.4.0.53</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.52">v19.4.0.52</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.50">v19.4.0.50</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.47">v19.4.0.47</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.43">v19.4.0.43</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.42">v19.4.0.42</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.41">v19.4.0.41</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.40">v19.4.0.40</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.4.0.48">v19.4.0.48 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.4.0.38">v19.4.0.38 Main Release</a></li></ul></li><li>2021 volume 3 - v19.3.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.3.0.57">v19.3.0.57</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.56">v19.3.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.55">v19.3.0.55</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.54">v19.3.0.54</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.48">v19.3.0.48</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.47">v19.3.0.47</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.46">v19.3.0.46</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.45">v19.3.0.45</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.44">v19.3.0.44</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.3.0.53">v19.3.0.53 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.3.0.43">v19.3.0.43 Main Release</a></li></ul></li><li>2021 Volume 2 - v19.2.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.2.0.62">v19.2.0.62</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.60">v19.2.0.60</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.59">v19.2.0.59</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.57">v19.2.0.57</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.56">v19.2.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.51">v19.2.0.51</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.49">v19.2.0.49</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.48">v19.2.0.48</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.47">v19.2.0.47</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.46">v19.2.0.46</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.2.0.55">v19.2.0.55 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.2.0.44">v19.2.0.44 Main Release </a></li></ul></li><li>2021 Volume 1 - v19.1.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v19.1.0.64">v19.1.0.64</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.59">v19.1.0.59</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.58">v19.1.0.58</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.57">v19.1.0.57</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.56">v19.1.0.56</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.55">v19.1.0.55</a></li></ul></li><li><a href="/xamarin-android/release-notes/v19.1.0.63">v19.1.0.63 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v19.1.0.54">v19.1.0.54 Main release</a></li></ul></li><li>2020 Volume 4 - v18.4.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.4.0.49">v18.4.0.49</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.48">v18.4.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.47">v18.4.0.47</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.46">v18.4.0.46</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.44">v18.4.0.44</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.43">v18.4.0.43</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.42">v18.4.0.42</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.41">v18.4.0.41</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.35">v18.4.0.35</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.34">v18.4.0.34</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.33">v18.4.0.33</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.32">v18.4.0.32</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.31">v18.4.0.31</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.4.0.39">v18.4.0.39 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v18.4.0.30">v18.4.0.30 Main Release</a></li></ul></li><li>2020 Volume 3  - v18.3.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.3.0.53">v18.3.0.53</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.52">v18.3.0.52</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.51">v18.3.0.51</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.50">v18.3.0.50</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.48">v18.3.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.44">v18.3.0.44</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.42">v18.3.0.42</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.40">v18.3.0.40</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.38">v18.3.0.38</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.3.0.47">v18.3.0.47 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v18.3.0.35">v18.3.0.35 Main release</a></li></ul></li><li>2020 Volume 2 - v18.2.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.2.0.59">v18.2.0.59</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.58">v18.2.0.58</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.57">v18.2.0.57</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.56">v18.2.0.56</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.55">v18.2.0.55</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.54">v18.2.0.54</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.48">v18.2.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.47">v18.2.0.47</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.46">v18.2.0.46</a></li><li><a href="/xamarin-android/release-notes/v18.2.0.45">v18.2.0.45</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.2.0.44">v18.2.0.44 Main Release</a></li></ul></li><li>2020 Volume 1 - v18.1.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v18.1.0.56">v18.1.0.56</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.55">v18.1.0.55</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.54">v18.1.0.54</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.53">v18.1.0.53</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.48">v18.1.0.48</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.46">v18.1.0.46</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.45">v18.1.0.45</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.44">v18.1.0.44</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.43">v18.1.0.43</a></li></ul></li><li><a href="/xamarin-android/release-notes/v18.1.0.52">v18.1.0.52 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.42">v18.1.0.42 Main Release</a></li><li><a href="/xamarin-android/release-notes/v18.1.0.36">v18.1.0.36 Beta Release</a></li></ul></li><li>2019 Volume 4 - v17.4.0.*<ul><li> Weekly Nuget Release <ul><li><a href="/xamarin-android/release-notes/v17.4.0.55">v17.4.0.55</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.53">v17.4.0.53</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.51">v17.4.0.51</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.50">v17.4.0.50</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.49">v17.4.0.49</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.47">v17.4.0.47</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.44">v17.4.0.44</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.43">v17.4.0.43</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.41">v17.4.0.41</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.40">v17.4.0.40</a></li></ul></li><li><a href="/xamarin-android/release-notes/v17.4.0.46">v17.4.0.46 Service Pack Release</a></li><li><a href="/xamarin-android/release-notes/v17.4.0.39">v17.4.0.39 Main Release</a></li></ul></li>
 			<li>2019 Volume 3 - v17.3.0.*
 				<ul>
 				    <li> Weekly Nuget Release 
diff --git a/xamarin-android/Introduction/System-Requirements.md b/xamarin-android/Introduction/System-Requirements.md
index e6f3b872..1979042e 100644
--- a/xamarin-android/Introduction/System-Requirements.md
+++ b/xamarin-android/Introduction/System-Requirements.md
@@ -1,13 +1,13 @@
 ---
 layout: post
 title: System Requirements | Xamarin.Android | Syncfusion
-description: System Requirements
+description: Describes about system requirements to install the Syncfusion Xamarin Android Components and list of supported platforms.
 platform: Xamarin.Android
 control: Introduction
 documentation: ug
 ---
 
-# System Requirements
+# System Requirements for Xamarin.Android
 
 ### Hardware Environment
 
@@ -45,18 +45,18 @@ The following table lists the platforms supported by our Xamarin.Android control
         </th>
     </tr>
     <tr>
-        <td rowspan="2">
+        <td>
             Android
             <br/>
             <br/>
         </td>
-        <td rowspan="2">
+        <td>
         Phone, Tablet
         <br/>
         <br/>
         </td>
         <td>
-            SfPdfViewer, SfCheckBox
+            All controls 
             <br/>
             <br/>
         </td>
@@ -66,18 +66,6 @@ The following table lists the platforms supported by our Xamarin.Android control
             <br/>
         </td>
     </tr>
-     <tr>
-        <td>
-            All other controls 
-            <br/>
-            <br/>
-        </td>
-         <td>
-            API level 19 and later versions
-            <br/>
-            <br/>
-        </td>
-    </tr>
 </table>
 
 ### Target Framework (Compile SDK Version) for Android
diff --git a/xamarin-android/Licensing/licensing-faq/how-to-upgrade-from-trial-version-after-purchasing-a-license.md b/xamarin-android/Licensing/licensing-faq/how-to-upgrade-from-trial-version-after-purchasing-a-license.md
index e2daaabc..0f4f5ea5 100644
--- a/xamarin-android/Licensing/licensing-faq/how-to-upgrade-from-trial-version-after-purchasing-a-license.md
+++ b/xamarin-android/Licensing/licensing-faq/how-to-upgrade-from-trial-version-after-purchasing-a-license.md
@@ -9,9 +9,9 @@ documentation: ug
 
 # How to upgrade from Trial version after purchasing a license?
 
-To upgrade from trial version, there are two possible solutions.
+To upgrade from trial version,
 
-* Uninstall the trial version and install the fully licensed build from the [License & Downloads](https://www.syncfusion.com/account/downloads) section of our website.  
 * If you are using Syncfusion controls from [nuget.org](https://www.nuget.org/packages?q=syncfusion), replace the currently used trial license key with a paid license key that can be generated from the [License & Downloads](https://www.syncfusion.com/account/downloads) section of our website. Refer to [this](https://help.syncfusion.com/xamarin-android/licensing/registering-license-keys) topic for more information regarding registering the license in the application.
 
-N> License registration is not required if you reference Syncfusion assemblies from Licensed installer. These licensing changes applicable to all evaluators who refers the Syncfusion assemblies from evaluation installer and those who use Syncfusion NuGet packages from [nuget.org](https://www.nuget.org/).
\ No newline at end of file
+N> Starting with 2022 Volume 1 v20.1.0.47, all Syncfusion customers (evaluators and paid customers) who use Syncfusion installers or nuget packages from [nuget.org](https://www.nuget.org/packages?q=Syncfusion) must generate and register the corresponding platform and version license key in your projects.<br>
+For more information, please see [this](https://help.syncfusion.com/xamarin-android/licensing/licensing) help topic.
\ No newline at end of file
diff --git a/xamarin-android/Licensing/licensing.md b/xamarin-android/Licensing/licensing.md
index 852e81d3..134e38f5 100644
--- a/xamarin-android/Licensing/licensing.md
+++ b/xamarin-android/Licensing/licensing.md
@@ -19,7 +19,7 @@ margin-top: 1.5em;     margin-bottom: 1.5em;
 
 # Syncfusion Licensing in Xamarin
 
-We have introduced a new licensing system starting with version 16.2.0.x release of Essential Studio. These modifications apply to all evaluators and only to paid customers who use NuGet packages from [nuget.org](https://www.nuget.org/). Starting with v16.2.0.x, if you use the evaluation installer or the NuGet feed to reference Syncfusion assemblies, you must also include the corresponding platform and version license key in your projects.
+Starting with 2022 Volume 1 v20.1.0.47, all Syncfusion customers (evaluators and paid customers) who use Syncfusion installers or nuget packages from [nuget.org](https://www.nuget.org/packages?q=Syncfusion) must generate and register the corresponding platform and version license key in your projects.
 
 ### Difference between unlock key and license key
 
diff --git a/xamarin-android/Release-Notes/v20.1.0.47.md b/xamarin-android/Release-Notes/v20.1.0.47.md
new file mode 100644
index 00000000..c9fa1c6a
--- /dev/null
+++ b/xamarin-android/Release-Notes/v20.1.0.47.md
@@ -0,0 +1,32 @@
+---
+title: Essential Studio for Xamarin.Android 2022 volume 1 Main release Release Notes  
+description: Essential Studio for Xamarin.Android 2022 volume 1 Main release Release Notes  
+platform: Xamarin.Android
+documentation: ug
+---
+
+# Essential Studio for Xamarin.Android  Release Notes  
+
+{% include release-info.html date="April 4, 2022" version="v20.1.0.47" %} 
+
+<style>
+#license {
+    font-size: .88em!important;
+margin-top: 1.5em;     margin-bottom: 1.5em;
+    background-color: #def8ff;
+    padding: 10px 17px 14px;
+}
+</style>
+
+
+<div id="license">
+Starting with 2022 Volume 1 v20.1.0.47, all Syncfusion customers (evaluators and paid customers) who use Syncfusion installers or nuget packages from <a href="https://www.nuget.org/packages?q=Syncfusion">nuget.org</a> must generate and register the corresponding platform and version license key in your projects.
+For more information, please see this <a href="https://help.syncfusion.com/common/essential-studio/licensing/license-key">help topic</a>
+</div>
+
+
+{% directory path: _includes/release-notes/v20.1.0.47 %}
+
+{% include {{file.url}} %}
+
+{% enddirectory %}
\ No newline at end of file
diff --git a/xamarin-android/SfPdfViewer/FreeText-Annotation.md b/xamarin-android/SfPdfViewer/FreeText-Annotation.md
index fc0b7ee4..bae82b3a 100644
--- a/xamarin-android/SfPdfViewer/FreeText-Annotation.md
+++ b/xamarin-android/SfPdfViewer/FreeText-Annotation.md
@@ -371,6 +371,56 @@ private void PdfViewer_FreeTextAnnotationRemoved(object sender, FreeTextAnnotati
 {% endhighlight %}
 {% endtabs %}
 
+## How to lock or unlock the free text annotations?
+ 
+To lock or unlock all the free text annotation, set the `IsLocked` API to `true` or `false` respectively, and the following sample explains the same. But other annotation types can be moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the free text annotation interaction such as move, resize, remove, and attributes changes.
+pdfViewerControl.AnnotationSettings.FreeText.IsLocked = true;
+
+{% endhighlight %}
+{% endtabs %}
+ 
+Interactions with free text annotation types such as move, resize, remove or attribute changes will be allowed only if the `SfPdfViewer.AnnotationSettings.IsLocked` API is set to `false`. The following code prevents the unlocking of the free text annotations, although the `IsLocked` property of the free text annotation is set to `false`.
+ 
+{% tabs %}
+{% highlight c# %}
+
+//Disable the free text annotation interaction, though its 'IsLocked' property is set to ‘false’ .
+pdfViewerControl.AnnotationSettings.IsLocked = true;
+pdfViewerControl.AnnotationSettings.FreeText.IsLocked = false;
+
+{% endhighlight %}
+{% endtabs %}
+
+## How to enable or disable the free text annotation selection?
+
+To enable or disable the free text annotation selection, set the `Constraints` API to `AnnotationConstraints.Selectable` or `~AnnotationConstraints.Selectable` respectively, and the following sample explains the same. But other annotation types can be selected, moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the selection of free text annotations.
+pdfViewerControl.AnnotationSettings.FreeText.Constraints = ~AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
+Free text annotation selection will be allowed only if the `SfPdfViewer.AnnotationSettings.Constraints` API is set to `AnnotationConstraints.Selectable`. The following code prevents the free text annotations selection, even though the `Constraints` property of the free text annotation is set to `AnnotationConstraints.Selectable`.
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the free text annotation selection, though its 'Constraints' property is set to ‘AnnotationConstraints.Selectable’ 
+pdfViewerControl.AnnotationSettings.Constraints= ~AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.FreeText.Constraints = AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
 ## How to get and set the name of the free text annotations?
 
 The PDF Viewer allows the users to get and set the name of free text annotations through the [Name](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.IAnnotation.html#Syncfusion_SfPdfViewer_Android_IAnnotation_Name) API.
diff --git a/xamarin-android/SfPdfViewer/Getting-Started.md b/xamarin-android/SfPdfViewer/Getting-Started.md
index 635575a8..dbd8e758 100644
--- a/xamarin-android/SfPdfViewer/Getting-Started.md
+++ b/xamarin-android/SfPdfViewer/Getting-Started.md
@@ -401,6 +401,36 @@ private void PageDownButton_Click(object sender, System.EventArgs e)
 
 N>When the current page is the first page, GoToPreviousPage method will not have any effect. Similarly, when in last page, GoToNextPage method will not have any effect.
 
+## How to lock or unlock all the annotations?
+
+To lock or unlock all the annotations in a PDF, set the `SfPdfViewer.AnnotationSettings.IsLocked` API to `true` or `false` respectively. The default value of the API is false, and when it is set to true, annotations can be selected, but resizing, moving, editing, and removing actions will be disabled. Only the tapped and selected events from the annotations will be raised. The following code sample explains the same.
+
+{% tabs %}
+{% highlight c# %}
+
+//Lock all the annotations
+pdfViewerControl.AnnotationSettings.IsLocked = true;
+
+{% endhighlight %}
+{% endtabs %}
+
+N>The lock operation can also be enabled or disabled for a particular annotation type such as shape, free text, text markup, etc. Please find the code samples to enable or disable interaction for particular annotation from their respective sections.
+
+## How to enable or disable the annotation selection?
+
+To enable or disable the annotation selection, set the `SfPdfViewer.AnnotationSettings.Constraints` API to `AnnotationConstraints.Selectable` or `~AnnotationConstraints.Selectable` respectively. Annotations will be selected by default, and when this API is set to `~AnnotationConstraints.Selectable`, annotation selection, moving, resizing, removing and attribute changes will be disabled. Only the tapped events of the annotations will be raised. The following code sample explains the same.
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the selection of all annotation types.
+pdfViewerControl.AnnotationSettings.Constraints = ~AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
+N>The selection operation can also be enabled or disabled for a particular annotation type such as shape, free text, text markup, etc. Please find the code samples to enable or disable interaction for particular annotation from their respective sections.
+
 ## How to get the list of annotations present in the PDF?
 
 By using `Annotations` property, You can get the list of annotations present in the PDF document.
diff --git a/xamarin-android/SfPdfViewer/Handwritten-Signature.md b/xamarin-android/SfPdfViewer/Handwritten-Signature.md
index 3499af2d..fb151103 100644
--- a/xamarin-android/SfPdfViewer/Handwritten-Signature.md
+++ b/xamarin-android/SfPdfViewer/Handwritten-Signature.md
@@ -192,6 +192,56 @@ private void PdfViewer_InkSelected(object sender, Syncfusion.SfPdfViewer.Android
 {% endhighlight %}
 {% endtabs %}
 
+## How to lock or unlock the handwritten signature?
+ 
+To lock or unlock all the handwritten signature, set the `IsLocked` API to `true` or `false` respectively, and the following sample explains the same. But other annotation types can be moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the handwritten signature interaction such as move, resize, remove, and attributes changes.
+pdfViewerControl.AnnotationSettings.HandwrittenSignature.IsLocked = true;
+
+{% endhighlight %}
+{% endtabs %}
+ 
+Interactions with handwritten signature types such as move, resize, remove or attribute changes will be allowed only if the `SfPdfViewer.AnnotationSettings.IsLocked` API is set to `false`. The following code prevents the unlocking of the handwritten signatures, although the `IsLocked` property of the handwritten signature is set to `false`.
+ 
+{% tabs %}
+{% highlight c# %}
+
+//Disable the handwritten signature interaction, though its 'IsLocked' property is set to ‘false’ .
+pdfViewerControl.AnnotationSettings.IsLocked = true;
+pdfViewerControl.AnnotationSettings.HandwrittenSignature.IsLocked = false;
+
+{% endhighlight %}
+{% endtabs %}
+
+## How to enable or disable the handwritten signature selection?
+
+To enable or disable the handwritten signature selection, set the `Constraints` API to `AnnotationConstraints.Selectable` or `~AnnotationConstraints.Selectable` respectively, and the following sample explains the same. But other annotation types can be selected, moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the selection of handwritten signatures.
+pdfViewerControl.AnnotationSettings.HandwrittenSignature.Constraints = ~AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
+Handwritten signature selection will be allowed only if the `SfPdfViewer.AnnotationSettings.Constraints` API is set to `AnnotationConstraints.Selectable`. The following code prevents the handwritten signatures selection, even though the `Constraints` property of the handwritten signature annotation is set to `AnnotationConstraints.Selectable`.
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the handwritten signature selection, though its 'Constraints' property is set to ‘AnnotationConstraints.Selectable’ 
+pdfViewerControl.AnnotationSettings.Constraints= ~AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.HandwrittenSignature.Constraints = AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
 ## How to get and set the name of the handwritten signatures?
 
 The PDF Viewer allows the users to get and set the name of handwritten signatures through the [Name](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.IAnnotation.html#Syncfusion_SfPdfViewer_Android_IAnnotation_Name) API.
diff --git a/xamarin-android/SfPdfViewer/Ink.md b/xamarin-android/SfPdfViewer/Ink.md
index 41276c97..3a43a549 100644
--- a/xamarin-android/SfPdfViewer/Ink.md
+++ b/xamarin-android/SfPdfViewer/Ink.md
@@ -524,6 +524,56 @@ private void PdfViewer_AnnotationMovedOrResized(object sender, AnnotationMovedOr
 {% endhighlight %}
 {% endtabs %}
 
+## How to lock or unlock the ink annotations?
+ 
+To lock or unlock all the ink annotation, set the `IsLocked` API to `true` or `false` respectively, and the following sample explains the same. But other annotation types can be moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the ink annotation interaction such as move, resize, remove, and attributes changes.
+pdfViewerControl.AnnotationSettings.Ink.IsLocked = true;
+
+{% endhighlight %}
+{% endtabs %}
+ 
+Interactions with ink annotation types such as move, resize, remove or attribute changes will be allowed only if the `SfPdfViewer.AnnotationSettings.IsLocked` API is set to `false`. The following code prevents the unlocking of the ink annotations, although the `IsLocked` property of the ink annotation is set to `false`.
+ 
+{% tabs %}
+{% highlight c# %}
+
+//Disable the ink annotation interaction, though its 'IsLocked' property is set to ‘false’ .
+pdfViewerControl.AnnotationSettings.IsLocked = true;
+pdfViewerControl.AnnotationSettings.Ink.IsLocked = false;
+
+{% endhighlight %}
+{% endtabs %}
+
+## How to enable or disable the ink annotation selection?
+
+To enable or disable the ink annotation selection, set the `Constraints` API to `AnnotationConstraints.Selectable` or `~AnnotationConstraints.Selectable` respectively, and the following sample explains the same. But other annotation types can be selected, moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the selection of ink annotations.
+pdfViewerControl.AnnotationSettings.Ink.Constraints = ~AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
+Ink annotation selection will be allowed only if the `SfPdfViewer.AnnotationSettings.Constraints` API is set to `AnnotationConstraints.Selectable`. The following code prevents the ink annotations selection, even though the `Constraints` property of the ink annotation is set to `AnnotationConstraints.Selectable`.
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the ink annotation selection, though its 'Constraints' property is set to ‘AnnotationConstraints.Selectable’ 
+pdfViewerControl.AnnotationSettings.Constraints= ~AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.Ink.Constraints = AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
 ## How to render Ink strokes using custom ink points?
 
 By default, ink strokes are drawn by recording the points on the screen traversed by the input device (stylus or finger). The quality of the strokes thus drawn may not be satisfactory as it considers only raw points. If needed, the points can be modified using any algorithms to smoothen the strokes. 
diff --git a/xamarin-android/SfPdfViewer/Shape-Annotation.md b/xamarin-android/SfPdfViewer/Shape-Annotation.md
index 2247696c..07f181da 100644
--- a/xamarin-android/SfPdfViewer/Shape-Annotation.md
+++ b/xamarin-android/SfPdfViewer/Shape-Annotation.md
@@ -466,39 +466,37 @@ private void PdfViewer_ShapeAnnotationRemoved(object sender, ShapeAnnotationRemo
 {% endhighlight %}
 {% endtabs %}
 
-## How to enable or disable shape annotation interaction?
-
-The interaction operation can be enabled or disabled for shape annotation alone by setting the `IsLocked` API to `false` or `true` respectively.
-
-For example, the following code disables the interaction operations for all shape annotations in the PDF. But other annotation types can be selected, moved, resized, or removed. 
+## How to lock or unlock the shape annotations?
+ 
+To lock or unlock all the shape annotation, set the `IsLocked` API to `true` or `false` respectively, and the following sample explains the same. But other annotation types can be moved, resized, removed or their attributes can be changed. 
 
 {% tabs %}
 {% highlight c# %}
 
-//Disable the arrow annotation interaction
+//Disable the arrow annotation interaction such as move, resize, remove, and attributes changes.
 pdfViewerControl.AnnotationSettings.Arrow.Settings.IsLocked = true;
-
-//Disable the line annotation interaction
+ 
+//Disable the line annotation interaction such as move, resize, remove, and attributes changes.
 pdfViewerControl.AnnotationSettings.Line.Settings.IsLocked = true;
-
-//Disable the rectangle annotation interaction
+ 
+//Disable the rectangle annotation interaction such as move, resize, remove, and attributes changes.
 pdfViewerControl.AnnotationSettings.Rectangle.Settings.IsLocked = true;
-
-//Disable the circle annotation interaction
+ 
+//Disable the circle annotation interaction such as move, resize, remove, and attributes changes.
 pdfViewerControl.AnnotationSettings.Circle.Settings.IsLocked = true;
-
-//Disable the polygon annotation interaction
+ 
+//Disable the polygon annotation interaction such as move, resize, remove, and attributes changes.
 pdfViewerControl.AnnotationSettings.Polygon.Settings.IsLocked = true;
 
 {% endhighlight %}
 {% endtabs %}
-
-The interaction with shape annotation types will be allowed only if the [`SfPdfViewer.AnnotationSettings.IsLocked`](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.AnnotationSettings.html#Syncfusion_SfPdfViewer_Android_AnnotationSettings_IsLocked) API is set to `false`. The following code does not allow the interactions with shape annotations, although the `IsLocked` property of the shape annotation is set to `false`. 
-
+ 
+Interactions with shape annotation types such as move, resize, remove or attribute changes will be allowed only if the `SfPdfViewer.AnnotationSettings.IsLocked` API is set to `false`. The following code prevents the unlocking of the shape annotations, although the `IsLocked` property of the shape annotation is set to `false`.
+ 
 {% tabs %}
 {% highlight c# %}
 
-//Disables the shape annotation interaction, though its 'IsLocked' property is set to ‘false’ 
+//Disable the shape annotation interaction, though its 'IsLocked' property is set to ‘false’ .
 pdfViewerControl.AnnotationSettings.IsLocked = true;
 pdfViewerControl.AnnotationSettings.Arrow.Settings.IsLocked = false;
 pdfViewerControl.AnnotationSettings.Line.Settings.IsLocked = false;
@@ -509,7 +507,48 @@ pdfViewerControl.AnnotationSettings.Polygon.Settings.IsLocked = false;
 {% endhighlight %}
 {% endtabs %}
 
-N> The `IsLocked` properties of the classes [`RectangleAnnotation`](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.RectangleAnnotation.html), [`CircleAnnotation`](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.CircleAnnotation.html), [`LineAnnotation`](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.LineAnnotation.html) and [`ArrowAnnotation`](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.ArrowAnnotation.html) have been marked as obsolete. Use the `RectangleAnnotation.Settings.IsLocked`, `CircleAnnotation.Settings.IsLocked`, `LineAnnotation.Settings.IsLocked` and `ArrowAnnotation.Settings.IsLocked` properties instead.
+N> The `IsLocked` properties of the classes [RectangleAnnotation](https://help.syncfusion.com/cr/xamarin/Syncfusion.SfPdfViewer.XForms.RectangleAnnotation.html), [CircleAnnotation](https://help.syncfusion.com/cr/xamarin/Syncfusion.SfPdfViewer.XForms.CircleAnnotation.html), [LineAnnotation](https://help.syncfusion.com/cr/xamarin/Syncfusion.SfPdfViewer.XForms.LineAnnotation.html) and [ArrowAnnotation](https://help.syncfusion.com/cr/xamarin/Syncfusion.SfPdfViewer.XForms.ArrowAnnotation.html) have been marked as obsolete. Use the `RectangleAnnotation.Settings.IsLocked`, `CircleAnnotation.Settings.IsLocked`, `LineAnnotation.Settings.IsLocked` and `ArrowAnnotation.Settings.IsLocked` properties instead.
+
+## How to enable or disable the shape annotation selection?
+
+To enable or disable the shape annotation selection, set the `Constraints` API to `AnnotationConstraints.Selectable` or `~AnnotationConstraints.Selectable` respectively, and the following sample explains the same. But other annotation types can be selected, moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the selection of arrow annotations.
+pdfViewerControl.AnnotationSettings.Arrow.Settings.Constraints = ~AnnotationConstraints.Selectable;
+ 
+//Disable the selection of line annotations.
+pdfViewerControl.AnnotationSettings.Line.Settings.Constraints = ~AnnotationConstraints.Selectable;
+ 
+//Disable the selection of rectangle annotations. 
+pdfViewerControl.AnnotationSettings.Rectangle.Settings.Constraints = ~AnnotationConstraints.Selectable;
+ 
+//Disable the selection of circle annotations.
+pdfViewerControl.AnnotationSettings.Circle.Settings.Constraints = ~AnnotationConstraints.Selectable;
+ 
+//Disable the selection of polygon annotations.
+pdfViewerControl.AnnotationSettings.Polygon.Settings.Constraints = ~AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
+Shape annotation selection will be allowed only if the `SfPdfViewer.AnnotationSettings.Constraints` API is set to `AnnotationConstraints.Selectable`. The following code prevents the shape annotations selection, even though the `Constraints` property of the shape annotation is set to `AnnotationConstraints.Selectable`.
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the shape annotation selection, though its 'Constraints' property is set to ‘AnnotationConstraints.Selectable’ 
+pdfViewerControl.AnnotationSettings.Constraints= ~AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.Arrow.Settings.Constraints = AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.Line.Settings.Constraints = AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.Rectangle.Settings.Constraints = AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.Circle.Settings.Constraints = AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.Polygon.Settings.Constraints = AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
 
 ## How to get and set the name of the shape annotations?
 
diff --git a/xamarin-android/SfPdfViewer/TextMarkup.md b/xamarin-android/SfPdfViewer/TextMarkup.md
index 8559e8e5..2c768583 100644
--- a/xamarin-android/SfPdfViewer/TextMarkup.md
+++ b/xamarin-android/SfPdfViewer/TextMarkup.md
@@ -605,6 +605,72 @@ private void SaveButton_Click(object sender, EventArgs e)
 {% endtabs %}
 N>The CanUndo property is used to identify whether a document loaded in the PDF viewer is edited or not. When this property is set to true, means that the document in the PDF viewer is edited. 
 
+## How to lock or unlock the text markup annotations?
+ 
+To lock or unlock all the text markup annotation, set the `IsLocked` API to `true` or `false` respectively, and the following sample explains the same. But other annotation types can be moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the text markup highlight annotation interaction such as remove and attributes changes.
+pdfViewerControl.AnnotationSettings.TextMarkup.Highlight.IsLocked = true;
+
+//Disable the text markup underline annotation interaction such as remove and attributes changes.
+pdfViewerControl.AnnotationSettings.TextMarkup.Underline.IsLocked = true;
+
+//Disable the text markup strikethrough annotation interaction such as remove and attributes changes.
+pdfViewerControl.AnnotationSettings.TextMarkup.Strikethrough.IsLocked = true;
+
+{% endhighlight %}
+{% endtabs %}
+ 
+Interactions with text markup annotation types such as remove or attribute changes will be allowed only if the `SfPdfViewer.AnnotationSettings.IsLocked` API is set to `false`. The following code prevents the unlocking of the text markup annotations, although the `IsLocked` property of the text markup annotation is set to `false`.
+ 
+{% tabs %}
+{% highlight c# %}
+
+//Disable the text markup annotation interaction, though its 'IsLocked' property is set to ‘false’ 
+pdfViewerControl.AnnotationSettings.IsLocked = true;
+pdfViewerControl.AnnotationSettings.TextMarkup.Highlight.IsLocked = false;
+pdfViewerControl.AnnotationSettings.TextMarkup.Underline.IsLocked = false;
+pdfViewerControl.AnnotationSettings.TextMarkup.Strikethrough.IsLocked = false;
+
+{% endhighlight %}
+{% endtabs %}
+
+## How to enable or disable the text markup annotation selection?
+
+To enable or disable the text markup annotation selection, set the `Constraints` API to `AnnotationConstraints.Selectable` or `~AnnotationConstraints.Selectable` respectively, and the following sample explains the same. But other annotation types can be selected, moved, resized, removed or their attributes can be changed. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the selection of text markup highlight annotation 
+pdfViewerControl.AnnotationSettings.TextMarkup.Highlight.Constraints = ~AnnotationConstraints.Selectable;
+
+//Disable the selection of text markup underline annotation
+pdfViewerControl.AnnotationSettings.TextMarkup.Underline.Constraints = ~AnnotationConstraints.Selectable;
+
+//Disable the selection of text markup strikethrough annotation
+pdfViewerControl.AnnotationSettings.TextMarkup.Strikethrough.Constraints = ~AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
+Text markup annotation selection will be allowed only if the `SfPdfViewer.AnnotationSettings.Constraints` API is set to `AnnotationConstraints.Selectable`. The following code prevents the text markup annotations selection, even though the `Constraints` property of the text markup annotation is set to `AnnotationConstraints.Selectable`.
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the text markup annotation selection, though its 'Constraints' property is set to ‘AnnotationConstraints.Selectable’ 
+pdfViewerControl.AnnotationSettings.Constraints = ~AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.TextMarkup.Highlight.Constraints = AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.TextMarkup.Underline.Constraints = AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.TextMarkup.Strikethrough.Constraints = AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
 ## How to get and set the name of the text markup annotations?
 
 The PDF Viewer allows the users to get and set the name of text markup annotations through the [Name](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.IAnnotation.html#Syncfusion_SfPdfViewer_Android_IAnnotation_Name) API.
diff --git a/xamarin-android/SfPdfViewer/Working-with-PDF-Coordinates.md b/xamarin-android/SfPdfViewer/Working-with-PDF-Coordinates.md
new file mode 100644
index 00000000..cc343802
--- /dev/null
+++ b/xamarin-android/SfPdfViewer/Working-with-PDF-Coordinates.md
@@ -0,0 +1,164 @@
+---
+layout: post
+title: PDF coordinates in Xamarin.Android Pdf Viewer control | Syncfusion
+description: Learn here all about working with PDF coordinates and their conversions support in Syncfusion Xamarin.Android Pdf Viewer control and more.
+platform: Xamarin.Android
+control: SfPdfViewer
+documentation: ug
+---
+
+# Working with PDF coordinates
+
+PDF Viewer allows users to obtain the PDF page coordinates relative to the PDF Viewer's client coordinates and vice versa. It also allows you to obtain the scroll point relative to the PDF page coordinates and bring the given region into view.
+ 
+## Get and set scroll coordinates
+ 
+Navigate to the specified vertical and horizontal scroll offset coordinates in PDF Viewer using the `ScrollToOffset (HorizontalOffset, VerticalOffset)` method. You can also retrieve the current horizontal and vertical offset position by using the `HorizontalOffset` and `VerticalOffset` properties respectively in the SfPdfViewer class.
+ 
+{% tabs %}
+{% highlight c# %}
+
+//Retrieve the current horizontal offset of the PdfViewerControl.
+m_currentHorizontalOffset = pdfViewerControl.HorizontalOffset;
+ 
+//Retrieve the current vertical offset of the PdfViewerControl.
+m_currentVerticalOffset = pdfViewerControl.VerticalOffset;
+ 
+//Scroll the content to the specified vertical offset position in the PdfViewerControl.
+pdfViewerControl.ScrollToOffset(m_currentHorizontalOffset+10, m_currentVerticalOffset+10);
+
+{% endhighlight %}
+{% endtabs %}
+ 
+## PDF Viewer's coordinates or client coordinates
+
+![PDF Viewer client coordinates](pdfviewer_images/ClientCoordinates.png)
+ 
+You can obtain the PDF Viewer's client area (viewport) coordinates using the `ClientRectangle` property and the following code sample explains the same. This property will return the coordinate value without the consideration of non-client elements like toolbars and scroll bars. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Retrieve the coordinates of the PDF Viewer's client area (viewport)
+Rectangle clientRectangle = pdfViewerControl.ClientRectangle;
+
+{% endhighlight %}
+{% endtabs %}
+ 
+## PDF page coordinates
+
+![PDF page coordinates](pdfviewer_images/PageCoordinates.png)
+ 
+PDF page coordinates are represented in terms of device-independent coordinate system called user space, which is independent of the output device that will be used for printing or display. The user space coordinate system is initialized to a default state for each page of a PDF document. The length of a unit is **1/72 inch**, which is approximately the same as a unit of **point(pt)**. As an example, the dimensions of a letter-sized paper in PDF page coordinates are shown in the diagram below. 
+ 
+## Convert PDF Viewer's coordinates to PDF page coordinates
+ 
+You can obtain the PDF page coordinates using the `ConvertClientPointToPagePoint(clientPoint, pageNumber)` method by passing the client rectangle point and page number as input parameters. The following code sample explains how to convert a tapped client area position to a page point.  
+ 
+{% tabs %}
+{% highlight c# %}
+
+pdfViewerControl.Tapped += PdfViewerControl_Tapped; 
+ 
+// Handle the tapped event.
+private void PdfViewerControl_Tapped(object sender, TouchInteractionEventArgs e)
+{
+    //Retrieve the tapped client area position.
+    Point clientPoint = e.Position;
+ 
+    //Retrieve the page number that corresponds to the client point.
+    int pageNumber = pdfViewerControl.GetPageNumberFromClientPoint(clientPoint)
+ 
+    //Retrieve the page point.
+    Point pagePoint = pdfViewerControl.ConvertClientPointToPagePoint(clientPoint, pageNumber);
+} 
+		
+{% endhighlight %}
+{% endtabs %}
+ 
+## Convert PDF page coordinates to PDF Viewer's coordinates
+ 
+You can obtain the PDF page coordinates using the `ConvertPagePointToClientPoint(pagePoint, pageNumber)` method by passing the page point and page number as input parameters. The following code sample explains how to convert a shape annotation's position in the page coordinates to a client point. 
+
+{% tabs %}
+{% highlight c# %}
+
+//Get a shape annotation from the Annotations collection.
+ShapeAnnotation shapeAnnotation = pdfViewerControl.Annotations[0] as ShapeAnnotation;
+ 
+//Get the annotation’s page number.
+int pageNumber = shapeAnnotation.PageNumber;
+ 
+//Get the annotation bounds.
+Rectangle annotationBounds = shapeAnnotation.Bounds;
+ 
+//Find the position of the annotation in page coordinates.
+Point pagePoint = new Point(annotationBounds.X, annotationBounds.Y);
+ 
+//Convert the page point to client point.
+Point clientPoint = pdfViewerControl.ConvertPagePointToClientPoint(pagePoint, pageNumber)
+ 
+{% endhighlight %}
+{% endtabs %} 
+
+## Convert PDF page coordinates to scroll coordinates
+ 
+You can obtain the PDF Viewer's scroll coordinates using the `ConvertPagePointToScrollPoint(pagePoint, pageNumber)` method by passing the page point and page number as input parameters. The following code example explains how to convert a shape annotation’s position in the page coordinates to a scroll point and then scrolling to that annotation's position in the PDF Viewer.
+
+{% tabs %}
+{% highlight c# %}
+
+//Get a shape annotation from the Annotations collection.
+ShapeAnnotation shapeAnnotation = pdfViewerControl.Annotations[0] as ShapeAnnotation;
+ 
+//Get the annotation bounds.
+Rectangle annotationBounds = shapeAnnotation.Bounds;
+ 
+//Get the annotation’s page number.
+int pageNumber = shapeAnnotation.PageNumber;
+ 
+//Find the position of the annotation in page coordinates.
+Point pagePoint = new Point(annotationBounds.X, annotationBounds.Y);
+ 
+//Convert the page point to scroll point.
+Point scrollPoint = pdfViewerControl.ConvertPagePointToScrollPoint(pagePoint, pageNumber)
+ 
+//Scrolling to the annotation’s position using the ScrollToOffset API.
+pdfViewerControl.ScrollToOffset((float)scrollPoint.X, (float)scrollPoint.Y);
+ 
+{% endhighlight %}
+{% endtabs %}
+
+## Bring a particular region to the view
+ 
+You can bring the given rectangular region to view and zoom in the document to fit the region in the PDF Viewer's client area (viewport) using the `ZoomToRect(rectangle)` method by passing the rectangular region as input parameter. The following code sample explains how to bring a particular into view.
+
+{% tabs %}
+{% highlight c# %}
+
+//Get a shape annotation from the Annotations collection.
+ShapeAnnotation shapeAnnotation = pdfViewerControl.Annotations[0] as ShapeAnnotation;
+ 
+//Get the annotation bounds.
+Rectangle annotationBounds = shapeAnnotation.Bounds;
+ 
+//Convert the annotation bounds from the page coordinates to a rectangle in client coordinates. 
+Point topLeft = new Point(annotationBounds.Left, annotationBounds.Top);
+            
+Point rightBottom = new Point(annotationBounds.Right, annotationBounds.Bottom);
+            
+Point clientTopLeft = pdfViewerControl.ConvertPagePointToClientPoint(topLeft, pageNumber);
+            
+Point clientRightBottom = pdfViewerControl.ConvertPagePointToClientPoint(rightBottom, pageNumber);
+            
+double width = clientRightBottom.X - clientTopLeft.X;
+            
+double height = clientRightBottom.Y - clientTopLeft.Y;
+            
+Rectangle rectangleBounds = new Rectangle(clientTopLeft.X, clientTopLeft.Y, width, height);
+ 
+//Pass the converted rectangle in client coordinates to the ZoomToRect method. 
+pdfViewerControl.ZoomToRect(rectangleBounds);
+ 
+{% endhighlight %}
+{% endtabs %}
diff --git a/xamarin-android/SfPdfViewer/Working-with-custom-stamp-annotations.md b/xamarin-android/SfPdfViewer/Working-with-custom-stamp-annotations.md
index 103332dc..522d4bf6 100644
--- a/xamarin-android/SfPdfViewer/Working-with-custom-stamp-annotations.md
+++ b/xamarin-android/SfPdfViewer/Working-with-custom-stamp-annotations.md
@@ -211,29 +211,52 @@ pdfViewer.StampAnnotationRemoved += PdfViewer_StampAnnotationRemoved;
 {% endhighlight %}
 {% endtabs %}
 
-## How to enable or disable custom stamp annotation interaction?
+## How to lock or unlock the custom stamp annotations?
+ 
+To lock or unlock all the custom stamp annotation, set the `IsLocked` API to `true` or `false` respectively, and the following sample explains the same. But other annotation types can be moved, resized, removed or their attributes can be changed. 
 
-The interaction operation can be enabled or disabled for custom stamp annotation alone by setting the `IsLocked` API to `false` or `true` respectively.
+{% tabs %}
+{% highlight c# %}
 
-For example, the following code disables the interaction operations for all custom stamp annotations in the PDF. But other annotation types can be selected, moved, resized, or removed. 
+//Disable the custom stamp annotation interaction such as move, resize, remove, and attributes changes.
+pdfViewerControl.AnnotationSettings.Stamp.IsLocked = true;
 
+{% endhighlight %}
+{% endtabs %}
+ 
+Interactions with custom stamp annotation types such as move, resize, remove or attribute changes will be allowed only if the `SfPdfViewer.AnnotationSettings.IsLocked` API is set to `false`. The following code prevents the unlocking of the custom stamp annotations, although the `IsLocked` property of the custom stamp annotation is set to `false`.
+ 
 {% tabs %}
 {% highlight c# %}
 
-//Disable the custom stamp annotation interaction
-pdfViewerControl.AnnotationSettings.Stamp.IsLocked = true;
+//Disable the custom stamp annotation interaction, though its 'IsLocked' property is set to ‘false’ .
+pdfViewerControl.AnnotationSettings.IsLocked = true;
+pdfViewerControl.AnnotationSettings.Stamp.IsLocked = false;
 
 {% endhighlight %}
 {% endtabs %}
 
-The interaction with custom stamp annotation types will be allowed only if the [`SfPdfViewer.AnnotationSettings.IsLocked`](https://help.syncfusion.com/cr/xamarin-android/Syncfusion.SfPdfViewer.Android.AnnotationSettings.html#Syncfusion_SfPdfViewer_Android_AnnotationSettings_IsLocked) API is set to `false`. The following code does not allow the interactions with custom stamp annotations, although the `IsLocked` property of the custom stamp annotation is set to `false`. 
+## How to enable or disable the custom stamp annotation selection?
+
+To enable or disable the custom stamp annotation selection, set the `Constraints` API to `AnnotationConstraints.Selectable` or `~AnnotationConstraints.Selectable` respectively, and the following sample explains the same. But other annotation types can be selected, moved, resized, removed or their attributes can be changed. 
 
 {% tabs %}
 {% highlight c# %}
 
-//Disables the custom stamp annotation interaction, though its 'IsLocked' property is set to ‘false’ 
-pdfViewerControl.AnnotationSettings.IsLocked = true;
-pdfViewerControl.AnnotationSettings.Stamp.IsLocked = false;
+//Disable the selection of custom stamp annotations.
+pdfViewerControl.AnnotationSettings.Stamp.Constraints = ~AnnotationConstraints.Selectable;
+
+{% endhighlight %}
+{% endtabs %}
+
+Custom stamp annotation selection will be allowed only if the `SfPdfViewer.AnnotationSettings.Constraints` API is set to `AnnotationConstraints.Selectable`. The following code prevents the custom stamp annotations selection, even though the `Constraints` property of the custom stamp annotation is set to `AnnotationConstraints.Selectable`.
+
+{% tabs %}
+{% highlight c# %}
+
+//Disable the custom stamp annotation selection, though its 'Constraints' property is set to ‘AnnotationConstraints.Selectable’ 
+pdfViewerControl.AnnotationSettings.Constraints= ~AnnotationConstraints.Selectable;
+pdfViewerControl.AnnotationSettings.Stamp.Constraints = AnnotationConstraints.Selectable;
 
 {% endhighlight %}
 {% endtabs %}
diff --git a/xamarin-android/SfPdfViewer/pdfviewer_images/ClientCoordinates.png b/xamarin-android/SfPdfViewer/pdfviewer_images/ClientCoordinates.png
new file mode 100644
index 00000000..41827262
Binary files /dev/null and b/xamarin-android/SfPdfViewer/pdfviewer_images/ClientCoordinates.png differ
diff --git a/xamarin-android/SfPdfViewer/pdfviewer_images/PageCoordinates.png b/xamarin-android/SfPdfViewer/pdfviewer_images/PageCoordinates.png
new file mode 100644
index 00000000..e3fdbed5
Binary files /dev/null and b/xamarin-android/SfPdfViewer/pdfviewer_images/PageCoordinates.png differ
diff --git a/xamarin-android/installation-and-upgrade/Download.md b/xamarin-android/installation-and-upgrade/Download.md
index be0fe5a7..46aa318d 100644
--- a/xamarin-android/installation-and-upgrade/Download.md
+++ b/xamarin-android/installation-and-upgrade/Download.md
@@ -10,13 +10,9 @@ documentation: ug
 
 # Download Xamarin Installer
 
-The Syncfusion Xamarin installer can be downloaded from the [Syncfusion](https://www.syncfusion.com/xamarin-ui-controls) website. You can either download the licensed installer or try our trial installer depending on your license. 
+The Syncfusion Xamarin installer can be downloaded from the [Syncfusion](https://www.syncfusion.com/xamarin-ui-controls) website.
 
-   -	Trial Installer
-   -	Licensed Installer
-
-
-## Download the Trial Version
+## Download using trial login
 
 Our 30-day trial can be downloaded in two ways.
 
@@ -27,18 +23,18 @@ Our 30-day trial can be downloaded in two ways.
 ### Download Free Trial Setup
 
 1. You can evaluate our 30-day free trial by visiting the [Download Free Trial](https://www.syncfusion.com/downloads) page and select the Xamarin platform.
-2. After completing the required form or logging in with your registered Syncfusion account, you can download the Xamarin trial installer from the confirmation page. (as shown in below screenshot.) 
+2. After completing the required form or logging in with your registered Syncfusion account, you can download the Xamarin installer from the confirmation page. (as shown in below screenshot.) 
    
    ![Trial and downloads of Syncfusion Essential Studio](download-images/trial-confirmation.png)
    
-3. With a trial license, only the latest version’s trial installer can be downloaded.
-4. After downloading, the Syncfusion Xamarin trial installer can be unlocked using either the trial unlock key or the Syncfusion registered login credential. More information on generating an unlock key can be found in [this](https://www.syncfusion.com/kb/8069/how-to-generate-unlock-key-for-essentials-studio-products) article.
-5. Before the trial expires, you can download the trial installer at any time from your registered account’s [Trials & Downloads](https://www.syncfusion.com/account/manage-trials/downloads) page (as shown in below screenshot.)
+3. With a trial license, only the latest version’s installer can be downloaded.
+4. After downloading, the Syncfusion Xamarin installer can be unlocked using either the trial unlock key or the Syncfusion registered login credential. More information on generating an unlock key can be found in [this](https://www.syncfusion.com/kb/8069/how-to-generate-unlock-key-for-essentials-studio-products) article.
+5. Before the trial expires, you can download the installer at any time from your registered account’s [Trials & Downloads](https://www.syncfusion.com/account/manage-trials/downloads) page (as shown in below screenshot.)
 6. Click the Download (element 1 in the screenshot below) button to get the Syncfusion Essential Studio Xamarin web installer.
  
    ![Trial and downloads of Syncfusion Essential Studio](download-images/trial-download.png)
 
-7. Click the More Download Options (element 2 in the above screenshot) button to get the Essential Studio Xamarin Offline trial installer which is available in EXE and ZIP format.
+7. Click the More Download Options (element 2 in the above screenshot) button to get the Essential Studio Xamarin Offline installer which is available in EXE and ZIP format.
 
    ![License and downloads of Syncfusion Essential Studio](download-images/start-trial-download-offline-installer.png)
    
@@ -55,14 +51,14 @@ You should initiate an evaluation if you have already obtained our components th
 
    N> If you've already used the trial products and they haven't expired, you won't be able to start the trial for the same product again.
 
-4. After you've started the trial, go to the [Trials & Downloads](https://www.syncfusion.com/account/manage-trials/downloads) page to get the latest version trial installer. You can generate the [unlock](https://www.syncfusion.com/kb/8069/how-to-generate-unlock-key-for-essentials-studio-products) key here at any time before the trial period expires. (as shown in below screenshot.)
+4. After you've started the trial, go to the [Trials & Downloads](https://www.syncfusion.com/account/manage-trials/downloads) page to get the latest version installer. You can generate the [unlock](https://www.syncfusion.com/kb/8069/how-to-generate-unlock-key-for-essentials-studio-products) key here at any time before the trial period expires. (as shown in below screenshot.)
 
    ![License and downloads of Syncfusion Essential Studio](download-images/start-trial-download-installer.png)
 
 5. You can find your current active trial products on the [Trials & Downloads](https://www.syncfusion.com/account/manage-trials/downloads) page.
    
 
-## Download the License Version
+## Download using licensed login
 
 1. Syncfusion licensed products will be available in the [License & Downloads](https://www.syncfusion.com/account/downloads) page under your registered Syncfusion account.
 2. You can view all the licenses (both active and expired) associated with your account.
@@ -74,5 +70,7 @@ You should initiate an evaluation if you have already obtained our components th
 
    ![License and downloads of Syncfusion Essential Studio](download-images/license-download.png)
 	
-	
+   N> Starting with 2022 Volume 1 v20.1.0.47, all Syncfusion customers (evaluators and paid customers) who use Syncfusion installers or nuget packages from [nuget.org](https://www.nuget.org/packages?q=Syncfusion) must generate and register the corresponding platform and version license key in your projects.<br>
+   For more information, please see [this](https://help.syncfusion.com/xamarin-android/licensing/licensing) help topic.
+   
 You can also refer to the [**Online installer**](https://help.syncfusion.com/xamarin-ios/installation-and-upgrade/install-using-the-web-installer) and [**Offline installer**](https://help.syncfusion.com/xamarin-ios/installation-and-upgrade/install-using-the-offline-installer) links for step-by-step installation guidelines.	
\ No newline at end of file
diff --git a/xamarin-android/installation-and-upgrade/Install-using-the-Offline-Installer.md b/xamarin-android/installation-and-upgrade/Install-using-the-Offline-Installer.md
index 49720a31..0062c644 100644
--- a/xamarin-android/installation-and-upgrade/Install-using-the-Offline-Installer.md
+++ b/xamarin-android/installation-and-upgrade/Install-using-the-Offline-Installer.md
@@ -10,7 +10,10 @@ documentation: ug
 
 # Installation using Offline Installer
 
-You can refer to the [**Download**](https://help.syncfusion.com/xamarin-android/installation-and-upgrade/download) section to learn how to get the Xamarin trial or licensed installer.
+You can refer to the [**Download**](https://help.syncfusion.com/xamarin-android/installation-and-upgrade/download) section to learn how to get the Xamarin installer.
+
+I> Starting with 2022 Volume 1 v20.1.0.47, all Syncfusion customers (evaluators and paid customers) who use Syncfusion installers or nuget packages from [nuget.org](https://www.nuget.org/packages?q=Syncfusion) must generate and register the corresponding platform and version license key in your projects.<br>
+For more information, please see [this](https://help.syncfusion.com/xamarin-android/licensing/licensing) help topic.
 
 ## Installing with UI   
 
diff --git a/xamarin-android/installation-and-upgrade/Install-using-the-Web-Installer.md b/xamarin-android/installation-and-upgrade/Install-using-the-Web-Installer.md
index f68ee65c..08bcc0a7 100644
--- a/xamarin-android/installation-and-upgrade/Install-using-the-Web-Installer.md
+++ b/xamarin-android/installation-and-upgrade/Install-using-the-Web-Installer.md
@@ -9,7 +9,10 @@ documentation: ug
 ---
 # Installation using Web Installer
 
-You can refer to the [**Download**](https://help.syncfusion.com/xamarin-android/installation-and-upgrade/download) section to learn how to get the Xamarin trial or licensed installer.
+You can refer to the [**Download**](https://help.syncfusion.com/xamarin-android/installation-and-upgrade/download) section to learn how to get the Xamarin installer.
+
+I> Starting with 2022 Volume 1 v20.1.0.47, all Syncfusion customers (evaluators and paid customers) who use Syncfusion installers or nuget packages from [nuget.org](https://www.nuget.org/packages?q=Syncfusion) must generate and register the corresponding platform and version license key in your projects.<br>
+For more information, please see [this](https://help.syncfusion.com/xamarin-android/licensing/licensing) help topic.
 
 ## Overview
 
@@ -87,9 +90,7 @@ The steps below show how to install Essential Studio Xamarin Web Installer.
 
 9.  The login wizard will appear. You must enter your Syncfusion email address and password. If you do not already have a Syncfusion account, you can create one by clicking on **Create an Account**. If you have forgotten your password, click **Forgot Password** to create a new one. Click the Install button. 
 
-    ![Login wizard install](WebInstaller/Step-by-Step-Installation_img9.png)
-	
-	I> The products you have chosen will be installed based on your Syncfusion License (Trial or Licensed).
+    ![Login wizard install](WebInstaller/Step-by-Step-Installation_img9.png)	
 
 10. The download and installation\uninstallation progress will be displayed as shown below.
 
@@ -170,9 +171,7 @@ N> If the **Syncfusion Essential Studio for Xamarin {version}** entry is selecte
 
 7.	The login wizard will appear. You must enter your Syncfusion email address and password. If you do not already have a Syncfusion account, you can create one by clicking on **Create an Account**. If you have forgotten your password, click **Forgot Password** to create a new one. Click the Install button.
 
-    ![Login wizard install/uninstall](WebInstaller/Step-by-Step-Installation_img9.png)
-	
-	I> The products you have chosen will be installed based on your Syncfusion License (Trial or Licensed).
+    ![Login wizard install/uninstall](WebInstaller/Step-by-Step-Installation_img9.png)	
 
 8.	The download, installation, and uninstallation progresses will be shown.
 
diff --git a/xamarin-android/installation-and-upgrade/Upgrade.md b/xamarin-android/installation-and-upgrade/Upgrade.md
index 68cc988e..7482ea5f 100644
--- a/xamarin-android/installation-and-upgrade/Upgrade.md
+++ b/xamarin-android/installation-and-upgrade/Upgrade.md
@@ -30,10 +30,10 @@ It is not required to install the Volume release before installing the Service P
 
 ## Upgrade from trial version to license version
 
-To upgrade from trial version, there are two possible solutions.
-
-* Uninstall the trial version and install the fully licensed build from the [License & Downloads](https://www.syncfusion.com/account/downloads) section of our website.  
+To upgrade from trial version,
+  
 * If you are using Syncfusion controls from [nuget.org](https://www.nuget.org/packages?q=syncfusion), replace the currently used trial license key with a paid license key that can be generated from the [License & Downloads](https://www.syncfusion.com/account/downloads) section of our website. Refer to [this](https://help.syncfusion.com/xamarin-android/licensing/registering-license-keys) topic for more information regarding registering the license in the application.
 
-N> License registration is not required if you reference Syncfusion assemblies from Licensed installer. These licensing changes applicable to all evaluators who refers the Syncfusion assemblies from evaluation installer and those who use Syncfusion NuGet packages from [nuget.org](https://www.nuget.org/).
+N> Starting with 2022 Volume 1 v20.1.0.47, all Syncfusion customers (evaluators and paid customers) who use Syncfusion installers or nuget packages from [nuget.org](https://www.nuget.org/packages?q=Syncfusion) must generate and register the corresponding platform and version license key in your projects.<br>
+For more information, please see [this](https://help.syncfusion.com/xamarin-android/licensing/licensing) help topic.