The batman_arkham_asylum11.zip file you have requested: Official Patches / Batman: Arkham Asylum v1.1 Patch - 270.62mb is not available. Perhaps try browsing all files for the game Batman: Arkham Asylum and upload any files you want to share or are missing. This is the only information we could locate:
This is the first patch for the PC version of Batman: Arkham Asylum, and updates the game to version 1.1. It also appears to contain PhysX support.