Open Steam, go to Library and right Click on SR2 then go to "Delete Local Content" and let it finish, that is the correct way to remove mods from Steam then download the Game all over again.
Well i am not sure, but your save crashes without GotR mod but it loads after installing the mod, which means the issue is either a mod related or a borked file within your installed files.
Well i am not sure, but your save crashes without GotR mod but it loads after installing the mod, which means the issue is either a mod related or a borked file within your installed files.