I'm sure .05 was out, as that's what I played.
It is a valid problem. It took about 3 days for the Steam version to come out. Coupled with their delayed releases (UK releases are after shops have copies) and their high prices (Play.com is typically a quid cheaper), I won't be buying anything 3rd party from Steam for a while.
EDIT: Correction.
This comment was edited on Nov 3, 2008, 19:08.