Armin_Fischer: This was definetly the last time i bought a game on GOG!! I have only problems all the time, nothing works! Some of my games i bought never worked on one of my computers and now i wanted to play my favorite game Anstoss 3 and SUDDENLY ALL GAMES are deleted on galaxy and not installed and if i want to install this game new there comes error messages..im so angry...nothing works with this stuff
I don't know jack about Galaxy, but if you like a more old school experience, you can just click on the drop-down menu on your profile name on the top bar, click on "Games" and it will bring you to your gaming library.
From there, you select the game you want to download and you download the "offline backup installers". These are standalone installers that will install the game.
The Linux version of the installers can be a little finicky at times (sometimes, you'll need to download some extra packages that aren't listed, so you might have to look at the error message you get when you start the game if you are missing the packages and do a bit of Googling), but the Windows version (which tend to be the one that is best maintained afaik) have yet to fail me for any of the games I played so far.