Hi mate, this worked for me, running out of space on my C SSD so I got it to download to D as well as install there

This has to be the most frustrating thing I've had to do, tried everything every forum has said to do, been uninstalling and reinstalling for over 2 hours trying to fix.

Your problem is the directory. Why, for the love of god, would you install games into program files directory? This isn't a game you know. UAC will fu*k your shit up with permission clusterfuck :)

OK, old but adding my input.

I kept having this problem on release, had to install from the site itself through the 10 or so downloads. Worked. Recently tried to update and it gave me the error again. So I uninstalled and reinstalled. Now it just was uninstalled and had the error again.

Here's where you go, "WHY?" There's a gear icon under your list of games, the dark grey portion on the left. This gear is on the bottom right of this section. This is settings. At the bottom of this window is a section called Folders, with an area called "Install games to:" with where you're installing games. You do not use the installation prompt when you install the game, you use THIS setting. Why? Because somehow it WORKED and the game is downloading and installing for me.

So go into GOG Galaxy's settings to set your install path, at least to where you have the most space. Because I don't know.

Thanks SIRTHOSIRIS! That solved the problem for me. What an absolutely idiotic system.

This solved it for me, thanks!

Didn't notice the cog for the settings (forgotten about it too) and was wondering what on earth was overriding my manual setting for installation directory when installing a new game...
...it was trying to install onto an old drive I had recently REMOVED from my PC :D I don't even...why not say that in the error message instead of "out of space". Lord, Gog...

Thanks, SirthOsiris.

Fix yo shizz, GoG.

Thanks SIRTHOSIRIS! That solved the problem even for me!

This is crazy, but unchecking "Create Desktop Shorcut" fixed it for me.

Try your downloads folder like I did. Or turn off the UAC temporarily or permanently. I have Windows 10 and the downloads folder worked for me.

Hey everyone.
I did everything said here and it didn't work. Then a read in another thread to uninstall Galaxy and re-install it using admin rights on the installer and install it on the same hdd as the game itself. Not 100% sure if this was the fix but now it's working. I hope this helps someone.

Same experience here. It would not work no matter what folder or even what drive I tried to install it on, even a de- and -reinstall of GOG Galaxy didn't work at first, eventually I just downloaded the game in question and installed it from my hard drive without using Galaxy.

Then less than a week later I tried it again and it worked without a hitch.

Maybe the de-and-re did work and something else went wrong that one time, or maybe a recent update on GOG's end fixed the problem. Don't know, don't care that much, it's working now is what matters.

I am having the same issue every time i download games, i end up deleting and redoing it multiple times. So here is what i found out. Windows 7/8 use a web cache folder for any download in C:/windows/temp and i found alot of the temp internet cache being dumped there as some protected file. I actually deleted all the temp stuff from the folder then did a defrag and cleaned up my free space. After doing that i went into GOG and changed it to my SAN which has 30TB free, and guess what it still did it one or 2 times, after re-verifying it would work. I do have admin rights, I think its a hardcoded bug in the installer.

Forgot to mention... Make sure you have at least 50-200GB free on your C drive, because windows manages the SWAP file on its own sometimes its over allocating disk space, which it doesn't report to you, This caused me soooo many headaches, i went in and created my swap file manually and set it to 50% more than it was using because that i believe is what was causing the error.

Zauważyłem, że Gog Galaxy tworzy zawsze folder tymczasowy w folderze na dysku, gdzie jest zainstalowany, więc wskazywanie folderów docelowych instalacji nie jest rozwiązaniem problemu. Należy przeinstalować aplikację GOG Galaxy na dysk, który ma więcej miejsca, niż pobierany plik.

Today I had the same problem and I noticed that Gog Galaxy always creates a temporary folder in a folder on the disk where it is installed , so identifying the target installation folder is not the solution to the problem . You should reinstall the application GOG Galaxy on a drive that has more space than the download. For me it worked.