For those who prefer not to use physical drives, you can send files directly from a PC over a local network.

Downloading PS4 games in (Package files) from sites like Internet Archive is a popular method for players to archive and preserve their digital libraries. This process is primarily used by owners of jailbroken consoles to install games, updates, and DLC directly to their systems. Understanding PKG Files and Archives

While official sources like the PlayStation Store provide legal downloads for standard consoles, community archives are the primary hubs for .pkg files:

: Place PKG files in the root folder (not in subfolders).