The PKG was not signed for your specific firmware or region. Fix: Update your CFW to the latest Evilnat version. Use a tool like PS3 Tools Collection to resign the PKG to your console's IDPS.
This PC application downloads PKG files directly from Sony’s official servers. It only includes games that were officially released on PSN, but the library is massive (over 2,000 titles). You need a "license" file (zRIF) to play them on CFW. Download Jogos Ps3 Pkg
: A popular community database that allows users to download PKG files directly from Sony's servers using publicly available links. The PKG was not signed for your specific firmware or region