Yep all the core files are ticked and there is nothing in the documents folder for it. Is there anywhere else user data could be stored for the game?Have you checked to make sure that all the core files are loading in the launcher? Check the "mods" tab in the launcher and make sure all core files are selected.
Also, you may need to delete all user data. Usually under Harddrive C, Users, Profile, Documents, Mount & Blade II Bannerlord.