pathfinderkingmaker Problem on iMac w/ Big Sur

[blackshoe18]

I started PF:Kingmaker sometime early last year, I think. At the time, I was running MacOS High Sierra. I installed the Unity Mod Manager and the Turn-Based Mod. After a while I put the game aside (got stuck in the Varnhold's Lot DLC). Then I upgraded to macOS Big Sur. Now the game crashes before I can get into it. It starts up, gets to the Kingmaker splash screen, the progress bar gets about 2/3 of the way across, and crash! This is, as I recall, about the point where the mod manager loads. So I think the problem is the mod stuff. So my question is how do I remove the mod and the mod manager if I can't get past this splash screen?