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When done, attempt the above procedures to try again. If the procedure still fails with an error, then hopefully you have a full system backup ready, which you can restore to your Mac using the option to restore from a Time Machine backup in the OS X Recovery partition, or whatever cloning software you use. The Terminal may take a while to complete this step, but when done you can reboot your Mac and hold the Option key to show the boot menu, and then select the El Capitan installation drive you just created to run the installer and upgrade your Mac’s internal hard drive. You will also need to have first downloaded the OS X El Capitan installer from the App Store, and have this present in your Applications folder.

Note that if you get any errors, be sure your USB drive is formatted and named “INSTALLER” so the command will properly target it. Press Enter to run the pasted command, and supply your password when prompted (it will not show when typed). N.app/Contents/Resources/createinstallme\ĭia -volume /Volumes/INSTALLER -applic\Ītionpath /Applications/Install\ OS\ X\ El\ Ca\ Sudo /Applications/Install\ OS\ X\ El\ Capita\

Open the OS X Terminal and run the following command (copy and paste all 5 lines):.

Use Disk Utility to format it to HFS+ with a GUID partition scheme, naming it INSTALLER.

For this, you will need a spare external drive (USB drive, or hard drive) that is at least 8GB in size, and then perform the following steps: If this program is missing or will not run, then move it to the trash and empty the trash, followed by re-downloading it from the App Store.Īn alternative approach is to create a dedicated installation drive from the El Capitan installer, and use that to install the upgrade.