Possible to have Core 2.x.x and Core 3.xx installed at once?

[horendus]

Is it possible to have core version 2 and 3 installed for use with Arduino IDE 2 with a way to target the version you want to use when compiling?

[me-no-dev]

one of them must be installed from git in your Arduino folder. Then you will have both cores accessible through the IDE. The one from git will have (in sketcbook) suffix to the name