Create a bootable macOS installer. Download macOS High Sierra from the App Store. Here is a link to find it on apple.com. When it’s finished, the installer will launch. As soon as it does, select File and Quit (or keyboard shortcut Command-Q) so it doesn’t install. The installer will remain in your Applications folder.
While the yearly major macOS update system is free to install, it is still limited to Macs that Apple deems compatible, and every year a generation of Macs essentially becomes obsolete. This is despite the fact that Apple is eager to emphasize that macOS is a widely compatible operating system.
I just checked my applications folder and there is an Install macOS High Sierra file this is 5.21 GB. I'm guessing that at some point I must have downloaded the update but never installed it. I am not planning to upgrade to High Sierra any time soon. Can I delete this file without any. Many Mac users that are trying to download macOS High Sierra from the Mac App Store will find that the small version of 19 MB of “Instead of the whole 5.2 GB installer for macOS High Sierra.app” has a download on the /Application folder of the target Mac. This is annoying as it prevents the use of one single download on many computers plus.
As it happens, there are still people with close to ten-year-old Apple desktop computers still in use on a daily basis, likely performing a range of lighter tasks.
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Which Macs Don't Support High Sierra
For some reason Apple doesn't want to allow these Macs to run one of its latest operating systems, namely macOS 10.13 High Sierra. This leaves the following Macs on macOS 10.11 El Capitan:
These machines are considered obsolete and vintage by Apple. The company defines vintage products as those that have not been manufactured for more than five years but less than seven years ago. Obsolete products are those discontinued more than seven years ago.
How To Install macOS High Sierra on Unsupported Macs
Though Apple doesn't support the above hardware officially, someone has thought about sharing the love for these older machines. A developer known as DOSDude1 has written a patch that works on Macs with the Penryn architecture. Using this still imposes certain limitations, but at least makes it possible to install macOS High Sierra on the following Macs:
Delete Install Macos High Sierra.app
If you happen to own any of the Penryn Macs mentioned above, the macOS High Sierra Patch Tool written by DOSDude1 will make running the latest software possible. But remember, with High Sierra you will also migrate to the Apple File System, and it is highly recommended that you first disable SIP because it may prevent the patch from working at all.
Installing the operating system on any of these Macs will require some technical knowledge, so it is not recommended for novice users. Also, a backup of your data is always a good idea in case anything goes wrong.
While there is a full step-by-step tutorial and video tutorial available on DOSDude1's website, it’s good to get a summary of the basics, which start with downloading the macOS High Sierra Installer app from the Mac App Store:
The Reason Not To Install macOS High Sierra on an Unsupported Mac
As you may have already experienced with other types of officially unsupported machines, the probability of having issues is much higher. The same applies in this case, too, since the macOS High Sierra Patcher will render your iMac 8.1 Broadcom Wi-Fi chip useless for certain models.
Macs that use the Broadcom BCM4321 Wi-Fi module will not have functional Wi-Fi when running High Sierra. Another issue that has been highlighted by the developer is that the trackpad in the MacBook 5,2 isn't fully supported in this version of OS.
These are just a few of the possible issues that could arise, and this is before even mentioning the various potential software errors that you can run into by using out-of-date hardware. Without getting the proper knowledge beforehand, you'll need to revert back to the previous state of the Mac, which won't be an easy process, especially not without a Time Machine backup.
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Other than downloading and installing macOS from App Store, you can also upgrade your Mac to macOS High Sierra with a clean install. A clean install of Mac OS will restore your Mac to factory settings and reinstall new Mac OS on the computer, which is right for you if you want to give your Mac/iMac/MacBook a fresh restart.
This tutorial will explain to you how to clean install macOS High Sierra step by step. You can also apply these steps to clean install macOS Sierra, OS X El Capitan, or the older OS X version on your Mac.
Part 1: Clean Install Mac OS vs Upgrade Mac OS
Usually we install a new version of Mac OS by upgrading to the new version. For example, as macOS High Sierra is released, we download the new operating system from App Store and run the installer to get it on our Mac. By upgrading to macOS Sierra from Sierra, El Capitan, etc., current data on the Mac are preserved and you can use your apps, files, photos and other data right away once the upgrade is completed.
Macos Sierra Installer App Download
Clean install of Mac OS, on the other hand, will delete all current data on Mac's drive and install on the drive a with a fresh copy of macOS High Sierra. Comparing to upgrading to macOS High Sierra, a clean install is more likely to give your Mac a better performance and it is often used to fix Mac system problems, such as speeding up a slow Mac.
Tip: If you need to recover deleted photos, files, videos, audio from Mac after clean installation, you can use FonePaw Data Recovery.
Part 2: Clean Install Mac OS from USB on Startup Drive
There are two types of clean install of macOS: installing Mac OS on the startup drive and installing the OS on non-startup drive. To perform a clean install on the startup drive, you need to make a bootable USB install drive of macOS, such as macOS High Sierra. Fresh install on the non-startup, on the other hand, requires you to have a second drive on the Mac.
The methods to perform these two types of clean install are different. We will cover the first one - how to clean install macOS High Sierra on Startup drive first.
Step 1: Backup your Mac
To clean install a Mac OS, you have to first erase everything on the drive. Therefore, it is important for you to back up files, apps and other needed data on your Mac before the install of the new OS. You can make a backup of your Mac to iCloud drive or you have to make a Time Machine backup.
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Step 2: Make a bootable flash installer of macOS
Next, you need to create a bootable macOS High Sierra USB drive.
Step 3: Erase the startup drive
Firstly, you need to boot up your Mac from the USB flash drive: restart your Mac while holding down the option button, when all of the bootable drives are displayed, select the macOS Sierra installer on the USB drive.
Once the Mac starts up, you will see the following macOS Utilities window.
Click Disk Utility, select your startup drive (usually named as Macintosh HD) and choose Erase. This will delete all contents of your startup, including the current version of the OS, photos, videos, music and other files.
Step 4: Clean install macOS High Sierra
Once the startup drive has been formatted, close Disk Utility and go back to the macOS Utilities window. This time, select Install macOS > Continue. Then choose the startup drive to install the macOS High Sierra.
Let the installation process to complete and your Mac will reboot.
Part 3: Clean Install macOS High Sierra Without USB
If you have an extra drive or volume on your Mac/MacBook/iMac and you would like to keep the older version of Mac OS on your startup drive, it is a good idea to install macOS High Sierra on the non-startup drive to try out the new features. Comparing to install macOS on the startup drive, clean install on the non-startup drive is much simpler because you run the installer directly from your Mac's startup drive with no need to make a bootable USB drive of the installer.
Step 1: Backup your Mac
Whether to fresh install Mac OS on startup or non-startup drive, it is critical to creating a whole backup of your Mac before a major OS install.
Step 2: Download macOS High Sierra installer
Then download macOS High Sierra installer from Mac App Store. The installer will be downloaded to /Applications folder and do not run the installer now.
Macos High Sierra Full Installer
Step 3: Erase the non-startup drive
If your Mac's non-starup drive contains other Mac operating systems, you need to format the drive with Disk Utility.
Go to Application > Utility > Disk Utility. Select the non-startup volume and choose Erase. After erasing the volume, all data on the volume will be deleted.
Note: If the non-startup drive doesn't have any Mac OS or only contains personal data, you may skip this step.
Can I Delete The Install Macos High Sierra Application
Step 4 Clean install macOS
Run the macOS High Sierra installer. When seeing this window, choose Show All Disk and select your Mac's non-startup disk to install the macOS. The installer will show the estimated time of completion for the installation process. Wait till the install completes.
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Do you have any question with a clean install of macOS High Sierra? Let us know in the comments below.
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