You can now experience even more exciting gaming with the first official expansion for Construction Simulator 2015! This DLC includes the Liebherr 150 EC-B Litronic flat top crane with a concrete bucket, a new trailer, and three new missions.
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