The day-one patch addressed immediate crashes and minor bugs. If you are downloading the game via Steam, this patch is automatically integrated into the download. You do not need to manually search for "Patch 1.01" if you own the Steam version.
If you are trying to use an old save file from the original version of the game, you will need a specific tool to convert it. batman arkham city patch pc download
Even with the official manual patch, the retail version still tries to call home to GFWL. You will likely still need the community fix below. The day-one patch addressed immediate crashes and minor bugs
The PC version is notorious for performance issues when features are enabled. If you are trying to use an old
: For Mac players, a patch (v1.2) updated the game from 32-bit to 64-bit and switched to the Metal API for better performance on newer macOS versions. Community & Performance Fixes News - Batman: Arkham City Updated - Steam