Because it works with Krita on a Windows 10 machine, I am so bold as to claim that this action fails for you on a Windows 11 machine “because Windows 11 is trying to be artificially intelligent”. Or in other words, here Microsoft is once again trying to be smarter than its customers, it is not acceptable (i.e. not for Microsoft) that the customer tells Windows what to do and how to do it! Since you are using the same Krita twice, so nothing has changed on Krita, the problem must lie elsewhere. And what has changed on your side? Windows!
Of course, I have no proof that it is as I claim. But I’m nearly sure that I’m right.
But there is a simple way for a clean separation of more than one Krita version using Windows: Create a second, third, fourth user account for every additional Krita installation you want to use. That is the way I’m using since the beginning of time (or something like that) and it works like a charm, you are even able to run these versions simultaneously without any issues, here you can see 7 different versions of Krita running simultaneously on my machine:
and this is the posting where I initially presented this:
Michelist