Downloading copyrighted video game software that you do not own is illegal in most jurisdictions.
For those interested in exploring PS4 ROMs or creating a ROM archive: ps4 roms archive
Necessary files to run newer versions of games. DLCs: Downloadable content. Legal and Ethical Considerations Downloading copyrighted video game software that you do
It is important to note that downloading copyrighted games you do not own is illegal. Generally, creating "archival copies" is considered acceptable only if the user owns the original physical software. The Rise of PS4 Emulation ps4 roms archive