Simply create a user-account for any Krita you want to run, so each version will be physically in its own environment. It works with only one little flaw, the versions in your extra accounts don’t accept drag & drop, you have to open files via your file manager. I tested this method using Windows and Linux, and it simply works, I’m using it for years now.
This even allows you running them simultaneously from your main account, or from any you are just logged in:
Once, I presented this in the following topic ↓, the screenshot ↑ is from there:
Michelist