I've just tried installing AI 21.2.2.  I didn't see an option to choose the install location, nor the choice that you used to get, to either install alongside or replace the previous version.  I looked in the program files folder as it was installing, and it seemed to be deleting files from the program folder for a previous version, so I immediately cancelled the installation.
Does 21.2.2 automatically replace previous versions?  How do I get it to install alongside, leaving the previous versions alone?