Amnesia wont start (steam)

[spootime]

I just bought Amnesia on the steam sale and I get a "this game is currently unavailable, please try again later" message when I try to start it. Ive currently tried reinstalling, verifying game cache, deleting clientregistry.blob, and updating all my video drivers. Can anyone help me out with this? I'd hate to have to return the game for steam credit but It's looking like thats my only option.