I came back from vacation this week and saw that an update needed to be done on AC Valhalla.
So I made this update and since then the game no longer works.
It launches and when the screen is displayed "search for extension" the screen freezes and returns to the desktop.
I spent several hours on this game (89% progress) and before installing this update the game was working fine.
I did a file check which didn't change anything.
I uninstalled the game and reinstalled it: same, crash when launching the game.
Note: my graphics drivers are up to date and I'm playing The Division 2 (1.426 hours of play) and Ghost Recon Breakpoint (260 hours) without any incident.
Only AC Valhalla is not working.
I wanted to buy Season Pass to play DLC but under these conditions, I give it up.
Thank you for your help