Critical: DLC will not work without the minimum required update. For example, attempting to load Separate Ways PKG on base game v1.00 will result in a “Missing Prerequisite” error. Always install the latest UPDATE PKG before the DLC PKG.

To have the complete Resident Evil 4 Remake on PS4 (excluding online leaderboards), you would need:

All PKGs must match the same CUSA region code (e.g., US vs EU) to work together.

In modern console ecosystems, the traditional concept of a "ROM" (Read-Only Memory) has evolved. Instead of a single dumped chip, software is distributed as encrypted, containerized packages. For the PS4, this is the .pkg format. When dealing with a complex modern release like Resident Evil 4 Remake, a complete "ROM" experience requires the synthesis of three distinct components: the Base Game, Title Updates, and DLC packages. Understanding how these interact is critical for software preservation and forensic analysis.