gloomfrost: this is the link
http://wpc.420c.edgecastcdn.net/00420C/files/P1_1/Patcher_GOG.exe however when i patched it i got an error message that it was an incorrect version or something like that.
It also reset my preferences from windowed mode back to full screen, so be warned. The game still works but the error message is unsettling.
I had the same message but when I looked the file versions were the same, 1.0.0.1
I was able to update and download the Troll DLC the next day so I assume that my game is up to date or something is not right. I have had no issues with the game so far, chapter 2, at least not that I'm aware of.
I will say this though, I have "installed" some mods that came out so those could be causing an issue?