This specific version is frequently found on digital platforms and modding sites:
This version is required for most modern "Trainers" (cheat software) to function correctly. Using an older game version with a v1.0.447.0 trainer typically causes the game to crash.
v1.0.447.0 is the most stable and updated build for the original release.
To run this version of Hitman: Absolution on PC, your system should meet these specifications: Hitman: Absolution system requirements - Can You RUN It