The Viking Forefathers Culture Pack adds The Norsemen as a new playable culture to Total War™: ATTILA. These factions may be used in Single or Multiplayer Campaign modes and Custom and Multiplayer battles. With the Viking Forefathers at their command, players can marshal the forces of The Geats, The Jutes and The Danes as they launch southwards from their icy homelands on campaigns of looting, raiding and conquest. In the bitter, windswept north, hard winters breed hard men, and Norse warriors are redoubtable in combat on land and sea. To these natural seafarers and expert coastal raiders, the plentiful lands to the south promise glorious victories and great plunder!
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