Larian Studios Forums Baldur's Gate III Baldur's Gate III - Technical & Gameplay Problems BG3 won't even launch new campaign with mods

Have you checked the mod folder with file explorer ? C:\Users\<username>\AppData\Local\Larian Studios\Baldur's Gate 3\Mods

I know uninstalling from BG3MM sometimes leaves files there, even though they are no longer visible in the interface.
And I think that steam uninstalls don't touch that area. (Though I may be wrong here)

So if you haven(t done that yet, check if all mods have effectively been removed, and then try to install them again.