You can buy the Gold Pack on Steam or GOG . It frequently goes on sale for around $5 during events like May the 4th.

Guide to Star Wars: Empire at War - Gold Pack is widely considered the definitive real-time strategy (RTS) experience in the Star Wars universe. Released in 2006, the Gold Pack combines the original base game with its massive expansion, Forces of Corruption , offering three unique factions and a sprawling galactic map to conquer. How to Get the Game

Focuses on hit-and-run tactics, superior fighters, and planetary liberation.

Relies on brute force, massive firepower, and the Death Star.

The game is light on modern hardware, though the 64-bit update improves stability for high-end PCs. STAR WARS™ Empire at War - Gold Pack on Steam