Soooo, I don't know how to "patch up via steam", I just download the ultrapatch and patch 1.12m. After that, I replaced the ddl-files you gave me, but still: the game is NOT starting at all - not if I choose IL2 through the steam game list or if I try to start it manually with the il2fb.exe.
Could there be another way to get this game working? Thx for all the help till now, guys.