The app's ressources can be used to create a new installer thumb drive with the well known command: sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app The installer package installs the "Install OS X El Capitan.app" in the Applications folder. Simply download a new OS X El Capitan install.dmg (with a valid cert chain this time), open the dmg and open the InstallOS.pkg. You probably used an old macOS installer app to create your USB bootable disk.Ī lot of macOS installer apps downloaded before Oct 2019/Nov 2019 contain an outdated certification chain and thus are invalid.
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