Official download link (win32):

https : // content-system . gog . com/open_link/download?path=/open/galaxy/client/setup_galaxy_2.0.86.13.exe

I recently rented a game on GOG that required additional software to play, so when I went to the advertised download page (gog . com /galaxy) I wasn't surprised that there wasn't anywhere on that page to actually download it! I contacted GOG support and the helpful representative agreed with me that the download link isn't present on that page, and gave me the download URL. So to save everyone else the trouble, here is the download link for GOG Galaxy.

I also believe there's a hidden way to enter in a special code on the download page to make the download button appear, so please feel free to post those special codes too if you know them, but I believe a download link will also be easier than having to do something special. Just click on the link and you're done!

I implore the GOG team to please sticky this, or to make a new post they manage with the download link, or to even just put a working download button on the gog . com /galaxy page, whichever option works best for them.

Hope this helps :D

Edit: please correct the download links accordingly, thank you!

Thank you for the link, I was looking for that.

I looked into the source code of the page and I tried opening it with a fake user-agent in my browser.
The page checks if you are running Mac or Windows and displays the correct button for your detected operating system.

Why they haven't done what every other site does and put a "Download another version" button or something similar, I have no idea.

So the most user friendly option is to download a User-agent switcher extension for your browser.
The user-agent is simply a short piece of text, where you browser tells the webserver, which browser and operating system you are running.
Now just pick a user-agent with Windows in the name, e.g. "Chrome on Windows" and reload the page. A nice download button will appear.

If you are more nerdy or just don't want to install anything, you can do the following:

There are two hidden buttons, one for Mac and one for Windows, at the bottom of the page, where you have a big "Discover GOG Galaxy" button. What we want to do is show the hidden buttons instead of the one you normally see. This can be accomplished with a single command, but we need to get into the developer tools in the web browser first.

Start by opening the console in your browser.
For Chrome, this is done by pressing Ctrl + Shift + I or through the menu "More Tools" -> "Developer Tools"
For Firefox, it is also Ctrl + Shift + I or through the menu "Tools" > "Web Developer" > "Web Developer Tools"
Regardless of browser, now select "Console" and type in "allow pasting" (it has to be typed, not copy + pasted).

Now copy the following line, paste it into the console and press enter.
[...document.getElementsByClassName('footer-microservice-download__button')].forEach((el, i) => el.style.display = i < 2 ? 'block' : 'none');

What the code does:
1. It gets all elements that have the class "footer-microservice-download__button", which returns the three buttons (the normal "Discover GOG Galaxy" button and the two hidden download buttons.
2. It then goes through the list of buttons and for the first two, sets their "display" property to "block", meaning it is displayed as a block, i.e. a rectangle on a line of its own. Any other results (the last button) it sets the "display" to "none", which simply hides it.

Now there is the added curiosity, that GOG has a link to the full offline installer for Mac, but the Windows link is just for a tiny "GOG_Galaxy_2.0.exe" web installer.

To get the full installer, you need the full version number, which they don't appear to show anywhere in the changelogs as far as I can tell, but fortunately, the Mac version has the full version number in the name, so you can copy the number from there.
For the most recent version, you can simply copy the Mac link and change the file name "galaxy_client_2.0.86.13.pkg" to the Windows file name "setup_galaxy_2.0.86.13.exe"

For other versions, this doesn't work.

The correct syntax is this:
https : // content-system . gog . com/open_link/download?path=/open/galaxy/client/2.0.86.13/setup_galaxy_2.0.86.13.exe

The version number is there twice. Both in the "directory path" and in the file name.
I tested this for versions 2.0.54.24, 2.0.73.27 and 2.0.86.13 and they all seem to work.

Hope this helps someone.

https://remote-config.gog.com/components/webinstaller?component_version=2.0.0

This should always give the current installer.