If I am not mistaken, there was a recent Steam update, that fixed the bug that made it update their games DESPITE having the "Do not automatically keep this game updated at all times" box checked. It appears to be working too, because I have been playing the game while having Steam set to online, and Steam has not updated my Skyrim exe. This is good, because I am someone that needs to have Steam running online because of other games I play with friends.