While a "Patch 1.05" originally existed for the base Generals game back in 2003 to fix balance issues like the GLA "fast build" bug, the modern is a distinct official update released for modern platforms.
It matches the game’s internal code to a state that allows for compilation with modern tools like Visual Studio 2015+. Generals Zero Hour Patch 1.05 Download
This update primarily serves as a bridge for the game’s longevity on modern systems: While a "Patch 1
The method for obtaining Patch 1.05 depends on which version of the game you own: Generals Zero Hour Patch 1.05 Download