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.
Here is the detailed breakdown:
Released in May 2014, this specific update focused on system compatibility and usability: adobe acrobat xi pro 1107 multilanguage chingliu 64 bit
While it is often sought after for its perpetual license feel, using this software today carries significant risks and compatibility issues. Key Components of the Release The version you mentioned does exist as an