Whether you are trying to install a physical copy of a 2000s classic or activating a digital purchase on a modern storefront, understanding how the license key system works is essential for a smooth experience. The Evolution of the Wolfenstein License Key
If you bought a "Steam Key" from a legitimate third-party site (like Humble Bundle or Green Man Gaming), the code will be in your confirmation email or your account's "Library" section on their site.
Digital keys often swap "0" (zero) for "O" (the letter) or "1" (one) for "I" (the letter). Double-check every character.