Will copy my reply from another post, hope it will help to you
Had the same issue, fixed that by updating my CPU driver. In windows it says that its up to date, but in practice it is not. Better to download it directly from the AMD website.
Created an account just to say, THANK YOU!
I went here:
https://www.amd.com/en/support/apu/...ssors-radeon-graphics/amd-ryzen-9-4900hs and just downloaded the auto-detect installer.
Did drivers only for the radeon part, and then some of the extras on the next part of the installer.
Once it was done, launcher works fine now.
More info..
I could launch BG3 directly form their executables, but the launcher would open and crash before the loading circle could even begin to rotate.
In "Event Viewer" it was a .Net crash that crashed the launcher.
Things I tried that did not work from other threads/articles..
Restart Steam - nope
Reboot laptop - nope
Verify game files - nope
Update Microsoft Windows Desktop Runtime from 3.1.8 to 3.1.16 - nope
Install .Net SDK 5 - nope
Rename the "Launcher" directory to have it create a new one - nope
Create a "Settings" directory for the launcher with a random settings.json file - nope
Complete re-install of BG3 - nope
Thanks again!