Worked for me as well. Just make sure that you set your steam update preferences to "update when launch only" & "never run background downloads" before you download the rollback. Then go to steam offline mode BEFORE you paste the new .exe, otherwise steam will just re-update skyrim when you open it to go to offline mode. Then just be sure that you never launch the game while you've got steam in online mode again! That should keep us safe from any more unwelcome updates, thanks so much for the link nightscrawl!