Oct 07, 2019 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 High Sierra, the installer will let you know. How to create a bootable macOS High Sierra installer drive Put the macOS High Sierra installer on an external USB thumb drive or hard drive and use it to install the operating system on a Mac.
Check compatibility
You can upgrade to macOS High Sierra from OS X Mountain Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 14.3GB 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
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 High Sierra, the installer will let you know.
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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 High 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 High Sierra, use this App Store link: Get macOS High Sierra.
Begin installation
After downloading, the installer opens automatically.
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.
If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.
Allow installation to complete
![High High](/uploads/1/2/6/6/126603080/921481224.png)
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.
Learn more
- If you have hardware or software that isn't compatible with High Sierra, you might be able to install an earlier macOS, such as Sierra or El Capitan.
- macOS High Sierra won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
- You can use macOS Recovery to reinstall macOS.
If you don't have a macOS Server installation and have multiple macs to upgrade, it can be a bandwidth-sucking chore. Instead, there's a way to download a full install of the latest version of High Sierra and make install media using the Terminal — AppleInsider shows you how.
If you only manage one Mac, you really don't need to do this, unless you want a local copy on hand form some reason. If you still want to get started, download macOS from the Mac App Store.
The installer will launch automatically after download. Quit the installer without installing High Sierra.
After downloading the installer, mount the volume you want to use to make the bootable installer. Your best bet is something fast, like an external SSD, or fast flash drive — the speed of your installs will vary greatly based on the speed of your media on both ends of the install.
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For the purposes of this tip, in the Finder name the external drive macinstall.
Enter:
sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia — volume /Volumes/macinstall and hit Return.
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The Terminal will request your administrator password, so enter it to validate and hit Return.
Confirm the external volume erase, rename, and copy, by hitting Y and hit Return when prompted.
When the Terminal informs you that the process is done, you should have bootable media which can be used on any compatible Mac. This works with nearly all media — but we've found that some cheap USB 3.0 flash drives won't boot, and there is no solution other than using a different drive.
If you do have a macOS Server installation, you can cache upgrade files on the server to only download them once. How to use macOS Server to do that is a tip for another day.
Mac Sierra
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