Depending on your operating system or the specific device you're targeting, the "PKG Viewer" you need will vary significantly. 1. PlayStation PKG Viewer (PS4/PS5)
Often used to "remarry" game updates with a base game or to check if a backup is compatible with a specific jailbroken firmware. 2. macOS PKG Viewer PKG Viewer
Ensures that a game, its DLC, and its updates all share the same Title ID to prevent installation errors. Depending on your operating system or the specific