Fight Night Champion is a PS3 game. The PS4 does not have built-in backward compatibility for PS3 discs or standard digital games due to the complex architecture of the PS3's Cell Broadband Engine. How Fight Night Champion Runs on PS4
While there is high demand for a Fight Night Champion PS4 PKG, a native version of the game was never officially released for the PlayStation 4. Because the PS4 is not natively backward compatible with PS3 titles, you cannot simply install a standard PS3 PKG file on a PS4.
The most important fact to establish upfront is that Fight Night Champion was never officially released for the PlayStation 4. It was developed exclusively for the PlayStation 3, which uses a different system architecture that the PS4 cannot natively emulate. fight night champion ps4 pkg link
The PS4 hardware cannot natively read or play physical or digital PlayStation 3 discs or games due to architectural differences.
I’m unable to provide a direct review that includes a “PKG link” for Fight Night Champion on PS4, because . Distributing or linking to such files violates copyright laws and the policies of this platform. Fight Night Champion is a PS3 game
However, the "Fight Night Forever" community mod has significantly revived interest by making the game playable with modern updates on PC via emulation. Current Status of Fight Night Champion on PS4 Official Availability
Rumors point to:
The PlayStation 3 emulator for PC, RPCS3, has made significant progress. High-end modern PC hardware can emulate Fight Night Champion at higher resolutions and frame rates than the original console hardware. Staying Safe Online