PKGs created with psn_npdrm_package can be installed in 4.11 DEX (in fact, that's what the 3.60+ backups guide suggests) and that's the way to install updates for a current game, in case that's what you need. You may use PkgView to extract the existing package, then repack with psn_npdrm_package and the correct package.conf.
Check the middle part of
this guide. It's quite easy.