This is for anyone dealing with no longer being able to remove broken mods because it breaks the save after Patch 5 changed how they work. Two of my friends rolled their game back to patch 4, removed the mods and made a new save without them, then re-installed their game to update to Patch 5. That fixed all of their issues.
It is a little time consuming but it was a definite fix that let them see the epilogue.
Follow the guide on this Reddit thread:
reddit.com/r/BaldursGate3/comments/17mlbxv/guide_how_to_roll_back_bg3_on_steam_to_prepatch_4
Download these depots from SteamDB for Patch 4 specifically:
Game resources:
download_depot 1086940 1086941 8583830751214113230
Game Executables and Libraries:
download_depot 1086940 1419652 431799251411575238
That's all you need.
Here's a Steam guide with screenshots to make things clearer, however it's missing a step my friends had to follow from the Reddit guide (overwriting files in the main BG3 Data folder):
https://steamcommunity.com/sharedfiles/filedetails/?id=3023295121
