Just like to add my two cents. I to had problems with BAT. Not an exaggeration, I think I installed/reinstalled, completely, something like five times. Continued to have small, nagging problems, e.g. missing aircraft, etc. But my hard headedness prevailed, thus the reinstalls. As a last resort, I downloaded "everything" again. Including the Mega Patch (did not need a new 4.07m). After running the mega patch and then running the BAT installer, I started the game to make sure it would run. It did. Then, each of the expansion packs, up thru 12. After each pack I started the game to see if all was well. It was, after each. The game is running well now, all seems there (what I had been missing), and the effort, although fairly time consuming, was worth it. I am convinced that I had a bad download somewhere along in my initial effort, and since I kept using those same files for each subsequent attempt, I kept getting the same results. Maybe this will help, or at least let you know you are not alone.