I also thought the military phrase.... "Terminate with extreme prejudice" was sooo clicky..... It now might be useful for anything related to steam.
Once you're done patching, you'll probably have to play with your firewall rules, and either allow the IL2fb.exe external access, or Port 21000, or both.
Make sure you're
have not installed your game in any of the
Program Files folders, coz you'll be plagued with access rights - This might be your steam patch problem as steam likes to go on your pc, where it shouldn't.