can't install any games on gog galaxy client, would hope it was better than epic game launcher. but atleast the epic game launcher works, this client have been stuck in "server problem" for 4 days, just why did you let me buy the game then if the server is scuffed......i will refund the game unless the "server problem" occurs again...i loved you gog why did you fuck it up...

Thread with two staff responses.

You can use a web browser to download the offline installers from your library. You can then click the cogwheel in the top left, choose Add Games & Friends, then Scan Folders for GOG Games. According to someone on the forum with this "Server Error" problem, cloud saves still work, so presumably achievements work as well.

Others have reported success getting GOG Galaxy to work by both disabling IPv6 and switching to Google Public DNS. If this works for you, consider using Cloudflare DNS so as not to inform Google of every site you visit.