I can't even start the download. I have the Obsidian edition. When I click install in Galaxy, I just get a small "Server Problem" message in the upper right corner. I have tried logging out, closing Galaxy, re-starting, and logging back in. It makes no difference.

It looks like the download may be working from a web browser. It's a multi-part download. I clicked the 8 meg installer and that was immediately downloaded. However, if I install the game this way, I don't know if I'll be able to add it to Galaxy later.

Update: I just got the download to start. First I went to the Manage Download page and clicked to start a download of a backup copy. Oddly enough, that started fine. I cancelled it after a minute or so. Then I clicked on the regular Install button again. Instead of the "Server Problem" message, the installation started as it should. I don't know if trying the backup copy first had anything to do with it, or if the server problem is simply fixed.

Thanks for the workaround, i had the same problem and doing your solution fixed the issue.