The safest and only official way to download games for free is through the "Free-to-Play" section of the PlayStation Store.
PKG games are a type of game package file used by the PlayStation 4 console. These files contain game data, including the game's code, assets, and other relevant information. PKG files are typically used for digital distribution of games on the PlayStation Store. pkg games ps4 download free
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Downloading and installing PS4 games in .pkg (Package) format for free generally refers to including the game's code