Backed via the Kickstarter. Used the GOG keys in order. Installed the game via GOG galaxy. Downloaded the the pre-order bonuses. When it was clear that the pre-order & kickstarter awards weren't in the game - I checked at Oleg's, I attempted to manually install them. I get the following error message:
"This version of the base game is not supported. Please update your game version with the latest patch." I am thinking the language patch hotfix is preventing it.

Kind of frustrated.

Matt Harris

I confirm. The same goes for extra portraits DLC (that was mentioned in another thread). The base game version is 23987, while the DLCs version is 23963. I think that the DLC files have to be patched as well.
update: It is fixed now. All files have the same version - 24012.

The latest patch fixed the problem for me anyway.

still haven't gotten my preorder items,

You mean in game?

So, anyone on Linux got their bonus? The download page only shows .exe files, which I don't think is terribly helpful...