I HATE STEAM!!! These forced updates stink. I just dont get why steam has to force updates if you play single player. They have done this for years, thank you Pwiz and Cal for staying up on it.
You can go into properties for any game individually and turn of automatic Steam updates for that game. Just right click the game in your library, go to properties, then go to Updates tab. Change the pull down menu from "Always keep this game up to date" to "Do not automatically update this game", click close and it will not update the game now.
This will let you play with trainer for single player as long as you want until you are ready to update the game you change that back. I beat the campaign on standard but wanted to do it on General with the trainer so I just turned off updates so I wouldn't have to bug the guys here to update every day they seem to be putting out a new patch.
[Edited by MaverickSY19, 6/28/2013 1:44:24 PM]