A SOLUTION (sort of)
I think this actually qualifies as a bug but one could argue whether it belongs to Intuit or Microsoft...
My C: drive is a pretty small SSD so I install everything I can on D:. That is where all my TT programs lived happily in Windows 10. The TT installation script allows you to install anywhere, so I kept installing on D: when trying to solve the error 190 in Windows 11. Finally, in a flash of inspiration (desperation??), I allowed the installations to go to the default location. When I do this, 2024 and 2023 both work. I did not try earlier years.
For me, this means that I will only install a version of TT when I need that year for something since I don't have the room to keep them all installed on C:.
Thanks to the Level 15 folks for all the help. Hopefully this experience will be helpful if someone else hits this situation.
'
