Players were required to enter a unique alphanumeric code during installation to prove they had purchased a legitimate copy. After installation, many games—including UEFA Euro 2008 —often required the physical disc to be in the drive to launch the game. This was a standard, though often frustrating, practice for PC gamers.
Looking for old boxed versions on websites like eBay or Facebook Marketplace is the most reliable method. Often, these used copies still have the sticker inside the manual. uefa euro 2008 pc game cd key verified