#Macos high sierra won t install how to#
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The machine will try to boot up and fail. Keep an eye on it, as it will reboot halfway through to complete the installation and you must be ready when it does.ġ4) When the machine reboots to complete the installation, hold down the alt/option key again to return to the screen pictured in Step 12. However, if you want to keep the existing installation on the unsupported machine and simply upgrade, run the installer without erasing the drive first. I recommend doing this for a fresh start. If you’re doing a clean install, use Disk Utility (included in the installer Utilities section) to erase the destination drive first.

#Macos high sierra won t install install#

This makes the machine search for other drives to boot from, in this case, our USB drive.ġ2) Select the USB installer from the list of drives which appears, to boot from it.ġ3) Once at the macOS installer, install the OS on your unsupported machine by going through the installer screens and selecting the hard drive in your unsupported machine as the destination. Turn on the unsupported machine whilst holding down the alt/option key. Once the installer is created, Sierra Patcher will say Complete! and your USB drive should now show as OS X Base System instead of its previous name.ġ1) Plug the USB installer we just created into the unsupported machine. Sierra Patcher will now create a macOS installer on the drive you selected, making edits on the fly so that the resulting installer can be used on unsupported machines. Mine is an 8GB USB drive, called USB.ġ0) When ready, click Start Operation… to begin. Navigate to your Applications folder and select it.ĩ) Click the Volume icon to select the drive to create our modified Sierra installer on.

#Macos high sierra won t install how to#

Related tutorial: How to disable System Integrity Protectionħ) Once everything is ready, launch the macOS Sierra Patcher application.Ĩ) In the patcher application, click on the Sierra installer icon to select your copy of macOS Sierra. Whilst it does lessen security somewhat, it is not the end of the world, and OS versions prior to El Capitan do not include it anyway. SIP must remain disabled at all times for this method to work, even after initial installation.

#Macos high sierra won t install download#

However, a direct download or a download inside a macOS VM can circumvent this requirement.Ĥ) Ensure the Install macOS Sierra app which you downloaded is in your /Applications folder.ĥ) Download dosdude’s tool, macOS Sierra Patcher.Ħ) Disable SIP on the machine you want to install Sierra on. To download this via the Mac App Store you will need access to a supported machine. Related tutorial: How to use Disk Utility to format drives on your Macģ) Download a copy of macOS Sierra 10.12.

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Instructions to install macOS Sierra on older Macsġ) Find yourself an 8GB or larger USB drive or external hard drive partition.Ģ) Format it as GUID Partition Map, Mac OS Extended (Journaled) using the Disk Utility application.

If you have one of the models listed above and want to give Sierra a try, follow our instructions below to make a modified Sierra installer with Sierra Patcher.

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Some machines, such as the MacBook Pro (2008/9), work perfectly with no modifications, leaving you to wonder why Apple thought it necessary to drop them at all. The most common is a lack of Wi-Fi due to the unsupported BCM4321 card in some machines, but this can often be replaced.

Please note, some machines have issues, as the table reports. In this guide, we’ll walk you through how to use the tool to install macOS 10.12 Sierra on older Mac hardware, which claims not to support it.Īpple’s hardware requirements for macOS 10.12 Sierra are now as follows:Ĭontrast this with the table below, which shows the additional machines on which Sierra can be installed with the help of macOS Sierra Patcher: In many cases this turned out to be true, and with a few tweaks and amendments many of the “unsupported” machines have been brought back into the fold by a tool by dosdude1, called macOS Sierra Patcher. This led some to conclude that Apple is simply raising the bar to encourage hardware upgrades, and that there is often no incontrovertible hardware reason which dictates the unsupported machines. However, many Mac owners have questioned their motives, observing that some machines have made the cut whilst their more powerful contemporaries (such as the MacBook Pro) have mysteriously been left behind. Citing various incompatibilities and hardware deficiencies, they cut out a large swathe of machines from running Sierra. With macOS Sierra, Apple dropped support for some of its hardware models for the first time in several years.