A USB 3.0 HDD or Flash Drive formatted to exFAT . (FAT32 has a 4GB file limit, and the God of War III PKG is roughly 40GB).
The PS4 often uses "PlayGo" technology, allowing the PKG to install the first few levels (the Poseidon boss fight) so the user can start playing while the remaining 40GB+ of data installs in the background. Why the PKG Format Matters god of war iii remastered ps4 pkg install
To understand "pkg install," you must understand the PS4’s file structure. A PKG (Package) file is Sony’s proprietary format for distributing games, updates, and DLC. A USB 3
The Technical Legacy of Chaos: Understanding the God of War III Remastered PKG System god of war iii remastered ps4 pkg install