- Check that both `\AppData\Local\Larian Studios\Baldur's Gate 3` is empty, and that there are no **__folders__** in \Steam\steamapps\common\Baldurs Gate 3\Data (or similar install paths depending on platform) other than "Localization". (Ignore the .pak files, they're supposed to be there, only look for folders specifically. This step is to make sure you don't have any old forgotten loose mod files. Typically the folders will be named 'Mods' and 'Public', if any.)
PS: Patch 7 moved the old /Documents/ content into /AppData/ so check both.