Strange that this problem still exists and the BETA version is still not in a stable release state.
Is it so hard to update their launcher? It took me 2 hours to find the problem and read trough the whole thread to know it is not my foult. Thank you all that you also addressed this problem in this thread.
Will also try to update to the beta version in the hope that this works.

It was fixed before the end of February.

1. Make sure GOG Galaxy isn't running. Double-check this in Task Manager. Launch the full 2.0.61.63 installer.
2. If you encounter any problems, perform a clean install instead.
3. Check what version you're on by clicking the cogwheel in the top left and choosing Settings. The version number is in the lower left corner of the Settings window. If you somehow still experience crashes on the latest version, open a support ticket.

Sorry, I'm still with the old client... Was this issue finally and officially fixed in the meanwhile?
If so, can I use public installer or I need a specific version?

Helpful link where you can download latest Game clients:
https://www.majorgeeks.com/mg/sortname/game_downloaders.html

AUTO-ANSWER: yes, has been fixed.