Are you looking to install this DLC on a or a digital backup of the game? Let me know your current PS3 setup (CFW or HEN) so I can provide the exact folder paths you'll need. Share public link
The "new" wave of PKG files usually comes from Redump or NoPayStation community archives. As of this writing, NoPayStation does not officially host MUA2 DLC due to legal gray areas, but the Internet Archive has verified, fresh dumps uploaded in 2023-2024. marvel ultimate alliance 2 ps3 dlc pkg new