![]() You can reboot from that disk and should be able to install El Capitan. Now we’ll have a valid installation medium which can be used to start the installer from. If you wish to continue type (Y) then press return: To continue we need to erase the disk at /Volumes/MyBlankUSBDrive. # "Install OS X El Capitan.app/Contents/Resources/createinstallmedia" -volume /Volumes/MyBlankUSBDrive -applicationpath "Install OS X El Capitan.app" $ mv InstallESD.dmg "Install OS X El Capitan.app/Contents/SharedSupport" The InstallESD.dmg image is missing, which we’ll need to add to the right location: $ mkdir "Install OS X El Capitan.app/Contents/SharedSupport" Install OS X El Capitan.app does not appear to be a valid OS installer application. ![]() In this example its named “MyBlankUSBDrive”: # "Install OS X El Capitan.app/Contents/Resources/createinstallmedia" -volume /Volumes/MyBlankUSBDrive -applicationpath "Install OS X El Capitan.app" Make sure you’ve attach another disk which can be overwritten by the installer. Now we can try to create the install media from the installer app. $ pkgutil -expand InstallMacOSX.pkg elcapitanĭistribution* InstallMacOSX.pkg/ Resources/
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