Same here! How can GOG owners want us to take them seriously...

Can't even install Warpips from Doc0075 now because of the server error. Please fix it ASAP GOG galaxy team. Time to download the offline installer like an old school gamer lol

At least the option is still there. Don't knock it till it's gone...

I cant install Fallout NV or Frostpunk Plus many others and im starting to get really annoyed

This is not solved. I also have this problem. Never had it before. Only had it after i clicked the survey explaining how i hate everything that has been done to gog galaxy in the last year. Hate it more now. Declaring it solved is abusive to your user base.

The person who started this thread back in May deemed the suggestion acceptable, and marked it as the solution.

The issue has since cropped up again for some users. The new thread is the "Staff response" link I posted above:
Not possible to download a game via GOG GALAXY : PROBLEM SERVER

Attempting to install a game but wont do anything. says server error. Does anyone know when they gonna fix this?

Forget the galaxy client - you don't need it.
Just download the normal game installers from your account - https://www.gog.com/en/account

I have the same problem, today still the server error, I cant install my gamesssss

Did you see my post right above yours?
There's nothing to stop you from install and enjoying your games.