It wasn't an official product. It was distributed as an IPS patch file—a digital overlay that users had to apply to an ISO file of the original game. It required a level of technical know-how that filtered out casual players, but for the hardcore fans, it was a revelation.
There is currently no complete fan-translated English patch for Generation of C.E. . Some older community discussions on platforms like It wasn't an official product
Relive the Cosmic Era: The Long-Awaited English Patch for Gundam SEED Destiny For years, Mobile Suit Gundam SEED Destiny: Generation of C.E. but for the hardcore fans