Can't install Gog Galaxy, only get a message saying to try reload again. Not any single reason of the problem so it's dead I'm closed to all games bought, and no downled 30 files to installa a game that's madness.

I joined the snapshot of the message. I already contacted support.

But can I download the previous versions? The update of it will probably work better.

Can I force the English/American/Polish install? I quote the message is in French could be the problem.

Is there any error log? I never seen a more stupid too generic error message, it smell programming with feet.

Try this direct link to version 2.0.59.41. The installer you normally get from the site needs to downloads components from the Internet during installation; people sometimes have problems with that part.
Reviews of this version are mixed. Some are saying it fixes the problem of the client service constantly crashing while others are reporting other crashes.

If you want an older version, get 2.0.55.99. It's the last before the aforementioned problems started, and the one I'm sticking with for now.

If you continue having problems, install both vc_redist.x86.exe and vc_redist.x64.exe and restart your system before retrying.

Woo impossible to answer you with Firefox I use for anything, I can't believe it. Posting with Safari I never ever use, sigh.

Anyway, huge difference with the first link you provided me, thanks. With this link the install worked fine.