With the Intro Pack, you get the Prologue and Paris episode. You’ll get full access to Contracts Mode, Escalation Mode, elusive targets and other live content.
Purchase HITMAN Upgrade Pack Here to receive access to all future six episodes, including 5 other locations. Content received as part of the Upgrade pack will be released periodically throughout 2016.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam