What version of the last patch for GOG version?
I saw in steam, there is new update 1.1.2.
Is this patch is compatible with GOG version?

Thanks

Short answer, No. Apparently GOG patch is totally outdated.

2.something, odd thing, when I go to launch the game it informed me that my current version, wasn't current. Now patching aargh.
Downloading patch 1.1.1

The Youtube play through is more of an introduction to the game. His version of the game is 1.5.
It seems that GOG's universal patch is already outdated. Weird ;)

Now downloading patch 1.1.2. It looks like I'm going to have to download all of the relevant patches for the game ;(
There are only two patches to download, I hope I answered your question.

I'm guessing it only does official patches. The Steam version has the option of using beta patches (think current is 1.1.5d or something)

http://www.mediafire.com/download/j27ceats6164b2n/1.1.3.zip

Or get it from the official location by changing the name of the version.

1.1.3 can be now downloaded from the game update exe.