My genuine sympathy. I have suffered about 5 major dodgy Win 10 updates this year that have caused me a lot of grief. They took hours to sort out but I did get there in the end. There is a specific reason why I had problems that others didn't suffer, but they should not have arisen with a properly constructed update.
I suggest you are best advised to go the the Microsoft support forum and post your predicament there. There are some genuinely knowledgeable people on that forum who will help with a pretty drastic problem like yours. The new app will load and run; your problem is the log of preexisting programs has not made it through to Win11
I always wait for quite a long time before installing major upgrades for exactly this sort of reason.
Hope it is sorted out shortly.