If absolutely nothing works, the community has created a workaround. A user on the Steam Community forums (and Nexus Mods) created a "Steam API Emulator" specifically for Hitman: Absolution . This tricks the .exe into thinking Steam is initialized without actually talking to the Steam client.
Many users find that the error is caused by a lack of permissions. Setting both the Steam client and the game executable to run as an administrator often fixes this. Completely close hitman absolution failed to initialize steam fix
Hitman Absolution – How to Fix All Errors – Complete Tutorial If absolutely nothing works, the community has created
This is the fix for the "Failed to Initialize" error. Steam stores old login tokens and API data in a cache. When that cache gets bloated, Absolution can't read it. Many users find that the error is caused
Once the fix is applied, you can finally enjoy the story of Agent 47 protecting Victoria, from the Chicago Library to the Terminus Hotel.
If none of the above work, force the game to launch offline: