dmd: My last setup was Galaxy 1 on a computer that died about a month ago. The new computer foced me into galaxy 2. I found a link here that allowed me to revert to galaxy one, which seems to be working. Since the downloads were stopping with an error message that it couldn't load the files it seems unlikely that my computer was the problem
If it was a common problem, we would see more post here in the forum. (I'm not trying to defend GOG).
I would recommend to uninstall everything, not just the Galaxy but all the games and reinstall. I know how that sounds, but you want to make sure everything works perfectly.
And when you ask for help on the forum, try to provide as much info as possible. If you do want someone to help you.
Also, GOG staff most likely wont see you forum post. So it would be wise to contact their support team, if you unable to find a solution.