The PS4 PKG method is not the only way to play GT4 in the modern era.
To get GT4 running as a "PS2 Classic" on your PS4, you cannot simply insert a disc or download it from the official store. You will need: Is there a possibility to install old GT Games on PS4? Gran Turismo 4 Ps4 Pkg
: Emulating GT4 is notoriously difficult compared to other PS2 titles, often requiring specific tweaks that Sony's standard "PS2 Classics" emulator may not support natively. The PS4 PKG method is not the only