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The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category 'Functional'. The cookie is used to store the user consent for the cookies in the category 'Analytics'. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. To switch back to your original version of macOS, simply repeat the above steps. Your Mac will now boot into the version of macOS that’s stored on your external drive. When prompted, select your external drive.Hold down your Mac’s ‘Option’ key during startup.Make sure the external drive is attached to your Mac.This version of macOS will now be installed on your external hard drive. Click ‘Show All Disks,’ and then select your external drive.Read the terms and conditions, and if you’re happy to proceed, then click ‘Agree,’ followed by ‘Continue.’.Navigate to the installer that you want to use.Once you have the necessary files, you’re ready to install this version of macOS to your external hard drive: Install macOS on your external hard drive The easiest workaround, is to try and find another Mac user who’s willing to download the installer for you, as macOS installers aren’t user specific. If you want to run a version of macOS that you haven’t previously downloaded from the App Store, then things are going to get slightly trickier, as you won’t be able to download this version directly from the App Store. This will download the installer to your Mac’s ‘Applications’ folder. Find the version of macOS that you want to install, and then click its accompanying ‘Install’ button.If you want to install a version of macOS that you previously downloaded from the App Store, then you can just re-download the necessary installer: The next step, is downloading the installer for the version of macOS that you want to run from your external hard drive. INSTALL Mac OS on ANY Windows Laptop *Pear OS* !

External hard disk on mac