Yesterday, I had tried to install a game on GOG Galaxy and it kept giving me the oops! or would just time out.

I thought something was wrong with my version of GOG Galaxy. Now, I can't even install GOG galaxy. I have a great internet connection; so that is not the problem.

Other games download from other stores...Steam, Epic.

Any idea?

So now I did install the latest version of Gog Galaxy, but installing a game from Galaxy is still not happening.

The circle icon goes on and on.

Then Gog wonders why Steam is outselling them. Go figure.

Your system probably is not supported. Operating system?
You may lack some dependencies.
You can download and play the games without Galaxy. A good thing for those of us using Linux or older Windows.