Updating PS3 DLC PKG files is a relatively straightforward process. Here's how to do it:

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: These are decryption keys stored directly on the console hard drive to unlock content. Prerequisites for DLC Installation

The PKG file did not download completely or became corrupted during transfer to the USB drive.

Sony officially ended production of the PS3 in 2017, and while the PlayStation Store remains (tenuously) open for legacy hardware, many publishers have delisted their DLC. Rock Band tracks, Guitar Hero expansions, obscure JRPG costume packs, and even online multiplayer map packs have vanished.

Choose your DLC PKG file and wait for the installation bar to finish. Step 4: Content Activation