: You can find digital keys at retailers like Eneba or Driffle, which typically provide a key to be redeemed on the GOG platform.
To download (released in late 2007, though often associated with 2008-2009 updates), the most reliable method is through digital storefronts that specialize in retro PC compatibility. While the game's official multiplayer servers have been taken offline, you can still play single-player and LAN matches. Where to Download Download Empire Earth 3 PC Game 2009
: After purchasing from GOG, you can download the game through the GOG GALAXY app or via "Offline Backup Game Installers" from your account library. : You can find digital keys at retailers