Right-click the game > Manage > Browse local files Steam Support .
If Unlock DLC.zip is a zip file containing files meant to be placed into a game directory: Unlock DLC.zip
Run the game to check if the content is unlocked. Scenario 2: Container File for Downloads ( .dlc ) Right-click the game > Manage > Browse local
Find the main installation folder of the game. Unlock DLC.zip
Scenario 1: A Compressed Archive ( .zip containing game files)