Found an option in the launcher settings to reset the launcher, so the message mentioned above is now gone.

Launcher version kept the same.

Launcher Version: 1.0.1751493
BG3 Version: 4.1.1.1829258

Launcher and BG3.exe have admin rights.

When the screen gets black I can still go back to main menu.
Tested on Vulkan and DX11.

So I guess it's just the video that will not start.
So sad.