PS4 games are officially distributed as digital downloads via the Official PlayStation™Store or on physical Blu-ray discs.
Some third-party tools, like PKG Reaper , can compress game files by removing redundant data or language packs. For example, a 63.5 GB game can potentially be compressed to around 20.3 GB. ps4 iso games highly compressed link
Authentic PS4 digital games use the .PKG extension. The PS4 does not natively support .ISO or .IMG "disk image" formats. PS4 games are officially distributed as digital downloads
To ensure your console remains secure and your games work correctly, use these official methods: How To Play PS4 Games On PC - Full Guide like PKG Reaper