Pangaea666: I'm not seeing a patch to 3.0.6 in my library. Has it not been released? Why not? The full download appears to be 3.0.6, but that's a bit excessive, to say the least, for three minor changes.
HypersomniacLive: I suppose not.
GOG often says that when the patch is comparable in size to the installers, they see no point in providing a patch along with the updated installers. But I have no idea if it applies in this case, you have to ask Judas or better yet Thiev for a definite answer.
That shouldn't be the case here then, as the full installer is around 7 GB (without White March) and people on the official forum talked about the patch being 1.4 GB. And it would be much, much smaller on GOG, given the way they pack things, and the small fixes contained in this patch. Seems to me that it's in precisely these cases the benefit with a patch is biggest.
Maybe not a big deal given the game is a few years old now, but it should also be less load on GOG's servers when people can download a 10 MB patch instead of the whole game again, 7 GB a piece. Maybe easier to force Galaxy into the full installer though...
edit: From a developer on the official forum:
Apologies about the large download. The way Unity handles any changes to code (no matter how small) is that it rebuilds a large chunk of the game and repackages it all together. The patch doesn't change the size of the game on your hard drive, but it is a big download.