Jul 28, 2017 Once you’ve backed up your files and cleaned your Mac, you’re ready to reinstall macOS High Sierra. A Step-By-Step Guide to Reinstall macOS High Sierra Here’s how you can reinstall the macOS High Sierra and keep all files and user settings.
I have just had to replace the hard disk of my MacBook Pro, which was previously running Sierra. It's quite a high spec, if a few years old. I was very happy that the computer automatically downloaded an OS and installed it onto the new disk.
Mac Os High Sierra Download
The computer downloaded Lion (10.7.5), and the Sierra upgrade is dangled in front of me on the App store, but when I click 'get', it says it requires a minimum of 10.8. There appears to be no way to restore my computer to Sierra! There are some links in the App Store for upgrading Lion to intermediate OS's - but following the links leads to empty pages.
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Check compatibility
You can upgrade to macOS Sierra from OS X Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.
MacBook introduced in late 2009 or later MacBook Air introduced in late 2010 or later MacBook Pro introduced in mid 2010 or later Mac mini introduced in mid 2010 or later iMac introduced in late 2009 or later Mac Pro introduced in mid 2010 or later
To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu . If your Mac isn't compatible with macOS Sierra, the installer will let you know.
Make a backup
Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.
Get connected
It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.
Download macOS Sierra
For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.
If you still need macOS Sierra, use this link: Download macOS Sierra. A file named InstallOS.dmg will download to your Mac.
Install the macOS installer
Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallOS.pkg.
Follow the onscreen instructions, which will guide you through the steps necessary to install.
Begin installation
After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra.
Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Allow installation to complete
Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.
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Learn more
If you have hardware or software that isn't compatible with macOS Sierra, you might be able to install the previous version, OS X El Capitan.
macOS Sierra won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.