Basically you put Steam in offline mode - NOT online mode. (You can do that in the Steam settings.) Then make a shortcut to the game, where ever it is installed. (Either in the common file, or in Program Files (x86) - you may have to search for that one.)
Then in the shortcut you make, start the game with Admin rights.
I know you want to keep the Steam overlay up while playing, but it's one of those things that you can do one or the other, not both.
(11-21-2013, 12:53 PM)Jihadjoe Wrote: Oh god... The end of days... Agmen agreed with me.