Since there is no official download, you have two primary options:

The most popular method. RPCS3 is generally considered the "gold standard" for this title due to its frequent updates and performance patches.

Step into the Ring: How to Play Fight Night Champion on PC is widely regarded as one of the best boxing games ever made, but it was never officially released for PC. While you won't find a native "PC version" on Steam or the EA App, the gaming community has found ways to bring this console classic to your desktop using powerful emulators like RPCS3 (for PS3) and Xenia (for Xbox 360).

If you choose the emulation route, follow these steps to optimize your performance: