![]() ![]() ![]() 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app to create your USB bootable disk.Ī lot of macOS installer apps downloaded before Oct 2019/Nov 2019 contain an outdated certification chain and thus are invalid.
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