BKGaming: Close Galaxy. Go to your temp folder which is in !Downloads folder, which is in your folder were your games are installed by default. Try to delete all of that and relaunch. This is the stuff your downloading and this is were Galaxy temporarily stores it. Also report this on the Galaxy
mantis and include your logs. This appears to be a pretty rare bug.
Where can I find Galaxy logs on my computer?
On Windows Vista or later: C:\ProgramData\GOG.com\Galaxy\Logs
On Windows XP: C:\Documents and Settings\All Users\GOG.com\Galaxy\Logs
On Mac OS X: /Users/Shared/GOG.com/Galaxy/Logs
BKGaming: If it keeps happening perhaps try contacting Destro, Venom or MC... one of them would be the best to talk too.
Outside of that, not sure what else you can do other than deleting everything Galaxy related (expect games) and maybe trying to re-install Galaxy. There may be a cache file you could delete to reset Galaxy, but I don't want to tell you the wrong file.
I tried that, didn't seem to help. I decided to uninstall galaxy and reinstall it. That seems to have fixed it.
Hathur: In steam I can disable auto-updates / downloads and manually trigger downloads.
GR00T: Off topic, but I'm curious, as I was under the impression this was changed and you can no longer disable updates on Steam. I just checked a couple games and haven't found the option. So, if you know a way, I'd love to hear it.
Yeah they made that stupid change awhile ago. However, you can choose to "only update game when I launch game". This will cause the game only to download the patch when you start the game. Then put steam offline mode and play the game, it can't patch since you're in offline mode and launches normally.