A hotfix has been deployed to fix this. This thread is now irrelevant.

The new patch has an issue with the launcher throwing up errors and asking to download a MIcrosoft Net whatever, however installing it does not fix it.

To fix it go to;

  • ...SteamLibrary\steamapps\common\Baldurs Gate 3\DotNetCore
  • Reinstall windowsdesktop-runtime-6.0.11-win-x64

And that's it. Launcher will work properly then.

Posting this here in General so people can see and spread the message.