01. Go to C:\Users\UserName\Eidos\Batman Arkham Asylum\
02. Replace the SaveData folder with the one provided. Make a backup first.
03. Go to C:\Users\UserName\Appdata\Local\Microsoft\
04. Replace the XLive folder with the one provided. Make a backup first.
05. Run the game (the buggy Direct2Drive release).
06. It will show you that all save slots are empty.
07. Press the "Home" key on the keyboard.
08. Click "Sign in" on the Games For Windows Live screen.
09. Login to the "Scale" profile.
10. Click on the red X mark to close the GamesForWindows Live prompt.
11. Hit enter to reload the profile (it asks you to reload).
12. The fourth save slot shows you a savegame. Load it.
13. You are now at Botanical Gardens without the invisible wall.
14. Play through and finish the game. I did.