The funny thing with all the hallaballoo with Windows 11 is that folks think it's a completely different OS. It's not, it's basically Windows 10.5. I installed it yesterday and it's fine. All my programs work fine including 3DCoat. The only thing I hate and I'm sure there will be an update is that I run a dual monitor and when the OS first boots up all the icons and folders are over on the smaller monitor and then the system refreshes after a minute and it's all spread back out and in order as it should be. So that's my only niggle with 11 so far.
PS, you don't have to reinstall ANYTHING!
So don't worry!