If your PS3 is on the latest official firmware (OFW) 4.91 or higher, you cannot install arbitrary PKG files. You would need to downgrade (often impossible on later models) or wait for an exploit—which becomes rarer each year.
Here is a comprehensive guide on what you need to know about BO2 PKG files, the installation process, and how to stay safe while doing it. Why Download Black Ops 2 as a PKG? call of duty black ops 2 ps3 pkg download
: Ensure at least 16GB of free space for the base game. USB Drive : Formatted to FAT32 to transfer files. File Formats : .PKG : The game data file. .RAP : The digital license required to boot the game. 2. Where to Source Files If your PS3 is on the latest official firmware (OFW) 4
Downloading and installing Call of Duty: Black Ops 2 as a PKG file on a PS3 requires a jailbroken console (using Why Download Black Ops 2 as a PKG