Scan down the list of apps you’ve purchased or download for free (which is in order of when you downloaded them) and find the old version of macOS. Make sure you’re logged into the Mac App Store with the Apple ID you used to update to Sierra (or whichever version you want to clean install), then click Purchased in the menu bar along the top. If you’re using Sierra or earlier, we can use the same method as above, but it’s a bit harder to get the install file: Apple doesn’t offer downloads of outdated OS versions through the normal store front, and searching for ‘Sierra’ won’t find what you’re looking for. Once installation of High Sierra is complete, you can restoring apps and settings from a Time Machine backup, or download them again manually. Go back to the main menu and choose Install OS X.
Select ‘Disk Utility’ and your hard drive, then click Erase.
Choose to install macOS High Sierra from the drive. With the boot drive connected, start up – or restart – your Mac while holding down the Part 2 How to Create an OS X Recovery Disk Attach an external hard drive or USB stick and launch the Recovery Disk Assistant.
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