I don´t mind having an additional launcher at my pc for playing some games but whats the point when it doesn´t work?

Right now i had the 2nd time the issue of not beeing able to buy something via paypal. Started it yesterday and it stayed in the login loading window. After several restarts i gave up and went to the browser. Worked without any problems or delays.

And right after that Galaxy lost several times the connection to the server while downloading. (This preblem is usually fixed by an entire restart of the system.)

I mean i get it. You wanna compete with Steam and Epic, having 1 platform for all games. Sorry but not like this. It took now over 4 hours to buy and install a old game with less than 2 GB.

yes well that's a sever isssue and lets just say, you get what you pay for

I've never made a purchase through Galaxy, It's easier to use the website still, so can't say anything about that problem.

But regarding your download issue.
It could be the CDN that are having issues wich GOG connects you to. But it kinda sounds like you are having packet loss issues. Galaxy might not be good enough at handling that yet.

You could do a check with the test that Cloudflare has. There is a packet loss section. It should be 0 (zero).
https://speed.cloudflare.com/