You can use "Custom Firmware Tools" or apps like PSNPatch to import the RAP files into the system's internal database. Common Troubleshooting
On a hacked PS3 (running CFW like Evilnat or HEN), users can manually install PKG files via a package manager. However, simply installing a PKG is not enough—the console will refuse to launch the game because it lacks a valid license. pkg rap ps3
Hackers can modify the game executable (the EBOOT.BIN) to run in "Debug" mode. This strips the need for a license check entirely. These are often called (for PSN games) or BLES (for disc backups converted to PKG) that have been "resigned" for generic installation. You can use "Custom Firmware Tools" or apps