https://imgur.com/OLmQmAY

In English, the message says "You can't install the software. Please donwload it again. And contact the support it it fails."

What is the solution ?

..donwload it again?

Try this one:

https://cdn.gog.com/open/galaxy/client/setup_galaxy_2.0.17.61.exe

Edit: Latest version:

https://cdn.gog.com/open/galaxy/client/2.0.74.352/setup_galaxy_2.0.74.352.exe

Thanks Hustlethefan.
This version is working and has been installed.

Dear lord thank you sir, you're doing god's work. I was looking for a solution to this for over an hour, the rage sharks were swimming in my head.

You are the best!

Thanks you ! That work perfect ! :-)

You're welcome. :)

Here is an updated link to the most recent version:

https://cdn.gog.com/open/galaxy/client/2.0.74.352/setup_galaxy_2.0.74.352.exe

me it say acces refused when i try your link

Strange, still working on my end. Look at the attached screenshot.
Maybe try a different browser?!

Updated link to the newest version:

https://cdn.gog.com/open/galaxy/client/setup_galaxy_2.0.25.2.exe

Edit: Latest version:

https://cdn.gog.com/open/galaxy/client/2.0.74.352/setup_galaxy_2.0.74.352.exe

Thanks! Worked perfectly

thanks .if you don't mind me asking where do you find these offline installers

You're welcome. :)

You can find them on this site:

https://www.computerbase.de/downloads/games/gog-galaxy/

For the latest version, i just changed the version number at the end of the link. :)

Ohh...that's easy. I didn't expect that. thank you so much this really helped me

Hello,

Not sure if I can share this.
For users on my Discord server, i've made a shorten URL which lead you to latest full-setup (Windows only).
I didn't host any file on my server.

https://tu-vas.la/gog
https://tu-vas.la/gog/info (no redirect, show final link and other details)