BobFuse

Mate, your words are "Too bad there is no way you can prevent auto update in steam... ", this does prevent auto update, you didn't say anything about launching the game or whatever. I'm sorry for responding to exactly what you wrote, and not what you were thinking. I am after all, not a mind reader. Cheers.

Yes you can... Right - click game in steam library, click Properties, then second tab at the top is "UPDATES".