The V1.04 patch is a cumulative update, meaning it includes all fixes from previous versions (1.01 through 1.03). While often described as a minor hotfix, it provides essential corrections for competitive play:
Depending on which version of the game you own, you may not need to download this patch manually. Command & Conquer™ Generals Zero Hour on Steam Command And Conquer Generals Zero Hour V1 04 Download
Key changes in V1.04 include:
After first launch, close game and go to: %Documents%\Command and Conquer Generals Zero Hour Data\ The V1