The version you mentioned does exist as an official 64-bit build from Adobe — Adobe Acrobat XI Pro was a 32-bit application, even on 64-bit OS.
Using an outdated, cracked version (like a ChingLiu release) poses several dangers:
The version you mentioned does exist as an official 64-bit build from Adobe — Adobe Acrobat XI Pro was a 32-bit application, even on 64-bit OS.
Using an outdated, cracked version (like a ChingLiu release) poses several dangers: