Since these are unofficial files, they aren't on the PlayStation Store. Reliable community sources include:
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Why do players crave a PS4 PKG of a 20-year-old game? gran turismo 4 ps4 pkg best
If you prefer official releases on PS4, these are the current staples: Gran Turismo 3 Vs 4 - Which had the most magic? Since these are unofficial files, they aren't on
Alternatively, some community pre-built PKGs exist (e.g., “GT4 [Best Config v3] by BenGun”) — but their distribution isn’t condoned here. Since these are unofficial files