Well to tell you the truth it's /possible/ to rotate 'em. But due to a bug, you can only rotate them vertically, if you try to rotate horizontally, they are are fine in payload editor, but return to 0 rotation when in game.
I have no idea why or how the update utility doesnt work for you :huh:, i have put your files in my lo installation, ran the installer and everything was perfectly fine. Attached them for you, and anyone who have problems may use them. Btw, i fixed aspect ratio for you to 1.25, if you havent noticed 1.3333 squashes objects on 1280x1024 res. files.rar