The expansion introduced the ability to colonize Mars and utilize space-faring units.
Since the game is over 20 years old, you might encounter these hurdles: File- Empire.Earth.Gold.Edition.v2.0.0.3466.zip...
: Adds three new campaigns—Ancient Rome, World War II (Pacific), and the 22nd-century Space Age—along with new civilizations like Japan and the US. The expansion introduced the ability to colonize Mars
A third window popped up. It was the diplomacy screen. Four factions were listed, but not the Egyptians, Greeks, or Russians. World War II (Pacific)
Interestingly, many long-time fans actually prefer the base game over the expansion included in the Gold Edition.
, which is the bundled version of the original game and its expansion pack. Metacritic The Story of Empire Earth Gold Edition Developed by Stainless Steel Studios and released in November 2001, Empire Earth