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I would check their forums, this seems to be a big thread on the issue: https://www.gog.com/forum/general_beta_gog_galaxy_2.0/not_possible_to_download_a_game_via_gog_galaxy_problem_server/page9 Maybe disable IPv6?
GOG.com also allows you to download game installers directly, if nothing else that should get you going.
What kind of server issue? But generally the only way to resolve this is to try again later or contact the site’s support.
There’s not a lot that can be done if it is a real server side problem (500 range of HTTP errors.).
All it says is server issue in the top right when I click on install. I’m going to wait a day or two and update here if I remember.
Correction: it says “server problem” not that that helps anything