![]() select the name for the drive, the standard is to leave GPT (GUID Partition Map).In the window that opens, click the "Erase" button.select the hard drive on the left, if there is more than one, make sure that the right one is selected, because it will be formatted before installation.select "Disk Utility" from the menu, press "Enter" on the keyboard or use the mouse to select "Continue".Otherwise, follow the below procedure to continue to install macOS High Sierra: If your device has one hard disk drive and does not need to be configured, you skip to the next step. When the language selection option appears, select your preferred language and press "Enter" again.The process of copying files will start, it can take about half an hour.Use your mouse or keyboard arrows to select "Install macOS High Sierra" in the download window and press Enter.To boot from the external flash drive, follow the below algorithm: release the key when the download window appears on the screen.Hold down "Alt" ("Option" or "⌥") key on the keyboard to power on the device.The first step to install macOS High Sierra is to power off the device and disconnect all external drives (hard disks and flash drives). MacBook Pro and Mac mini (since mid-2010).MacBook and iMac (since the end of 2009).Which models you can install High Sierra on: You'll need a MacBook with High Sierra installed and an empty flash drive of 5.4 GB or more. It's easy to install macOS High Sierra yourself if you follow our instructions. In this article we will tell you how to install macOS High Sierra, what you will need to do and for which Apple devices models this software version can be installed.Īlso: Create a bootable USB Flash Drive: easy way 4 steps to install macOS High Sierra New drivers must be installed before you begin the OS installation to ensure that the device will work correctly. In future I'll probably just keep the computer on the OS it came with.After replacing the hard drive in your MacBook or iMac, you have to install macOS High Sierra. The greater value for money story that Apple likes to tell customers is not borne out by my experience. Really not satisfactory that Apple can't produce newer operating systems that run properly on machines that are 4 years old. I have a bootable Mojave installer, but that consistently leaves the iMac hard drive with overallocation errors that, in the six months I've been trying to fix this, have led to hard disk corruption problems in the end. So now I'm on to your last suggestion, Internet Recovery and attempting to put Sierra on it. Both attempts resulted in the pictured error message towards the end of the process. I tried downloading the High Sierra installer from my iMac with the turgid Big Sur installation. In any case I'm puzzled why they wouldn't permit the downloading of an older OS and then run a script that blocks you from installing it on a new machine if you tried to do that by mistake. If Apple OS installer files were still disk images instead of apps that run scripts, this wouldn't be an issue. It's also bizarre that you can't use a newer Mac to help fix an older one. ![]() ![]() Would have been helpful if Apple's error message said that instead of 'not available'. Thanks for that pointer about not being able to download an older version.
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