If you have a jailbroken console and understand the risks, here are the historical sources for PKG files:
You cannot simply download a PKG file, put it on a USB stick, and install it on a standard, unmodified PS3. Sony’s security will reject the signature. free ps3 games pkg download install
PKGI and NPS downloads usually include the required .rap files to make the games work, but you may need to place them in dev_hdd0/exdata . If you have a jailbroken console and understand
Once the game successfully boots past the copyright screen, you can safely remove the USB drive. Troubleshooting Common Errors put it on a USB stick