The Hitman Collection includes almost every Hitman title ever released for PC, including the Elite Edition of Hitman Absolution - the critically acclaimed, purest Hitman experience yet, along with all the extra downloadable content created for it.
1. Launch Steam and log into your account or create a new one (download Steam).
2. Choose "Games" from the menu and "Activate a Product on Steam".
3. Follow the onscreen instructions to complete the activation process.
4. You can find your new game in the "Library" tab.