I'm seriously ticked off at Steam right now. I turned off automatic updates for P VS Z because I did not want to lose the Michael Zombie (screw you Jackson estate and your pedophile son). I stoppe dworking and this is what Steam told me when I asked about it.
"Thank you for contacting Steam Support. The option to disable automatic updates does not disable the requirement for Steam to install the latest updates before launching your game. This option will only allow you to delay the update until you next choose to launch the game. There are no options for running Steam games without all necessary updates. If you have any further questions, please let us know."
Morale of the story, don't buy Steam games if think you might not want updates for that specific game.