One is the.pkg file that contains the actual OS. When you have downloaded them, you’ll have two packages. Step 1: Download the macOS Sierra package files from their respective URLs. Related: How to downgrade from macOS Mojave to macOS High Sierra Factory reset MacBook Air and other Macs with macOS How to create a macOS Catalina USB installer macOS could not be installed, how-to fix. Or use the OS X installation disc that came with your machine - or buy a new one - to boot up and install OS X on your Mac’s hard drive.
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