You can store PKG files on an exFAT-formatted USB drive, connect it to your PS4, and install them manually via the console's debugging menu. ConsoleMods Wiki Important Considerations Jailbreak Required:

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While the prospect of expanding a library is tempting, using unofficial PKG files carries significant risks: How to Install PKG Files - ConsoleMods Wiki

: Applications like the Homebrew Store or FPKGi act as on-console managers for browsing and downloading packages directly. Critical Risks and Considerations