Thanks! Tried everything I could find on that thread... changing region to French, running the WIndows troubleshooter for old programs, and updating Windows 10. Nothing worked unfortunately. Same error code. Did I miss anything? Any more suggestions?

... is there anything else I can do?

I tried running as admin, same problem. I don't know if I have the patch... I purchased it from Steam yesterday. Don't know if the patch comes preinstalled or not.

Just bought the game today, and every time I try to run it, it crashes before I even get to the menu with this error code:
Exception ElnvalidOp dans le module KERNALBASE.dll dans 00114192. Operation en virgule flottante incorrecte.