Press and hold the power button on your Mac until the startup options window appears showing available startup disks and Options. After your Mac shuts down, wait 10 seconds. As a result, the Mac OS Sierra installation gets stuck.On your Mac, choose Apple menu > Shut Down. However, in some cases, while updating your OS, things can get a little messed up. With just one click, you can go ahead and initiate the installation.It could be there has been a power shortage. There are many possible reasons why the installation is interrupted. It's the most important security component on your computer or network.Because of that, Apple’s servers slow down. As a result, SCS Computing Facilities (SCSCF) is phasing out software support for all computers running macOS 10.13 High Sierra and will end support on January 31, 2021.Whenever Apple releases an update for High Sierra, many Mac users will rush to download it. Prior to a Frozen High Sierra Installation If you still haven’t got past through the download stage, here are a few solutions to try:In keeping with Apple's release cycle, we anticipate macOS 10.13 High Sierra will no longer receive security updates starting in January 2021. But regardless of the reason, we’re here to give you all the possible solutions for a stuck Mac High Sierra update. Perhaps, there are other issues with your Mac prior to updating.
![]() Is The Sierra Safe For My Computer Mac OS Sierra InstallationFinally, press the Option/Alt key. After which, look for the update you are downloading. Start by navigating to the Mac App Store. About Outbyte, uninstall instructions, EULA, Privacy Policy.One of the possible fixes for a stuck download is to simply cancel it. To create bootable USB installer for Mac to Install Mac OS X El Capitan on.Believe it or not, downloading the update is much quicker when you use a wired connection than when you tap to a WiFi network.Special offer. On some other Macs, the screen will turn white, black, or grey that one cannot tell if the Mac is switched on or not.Alternatively, you may also find your Mac frozen on the installation page with a message saying, “macOS could not be installed on your computer.” And if you click the Restart button, the same message will show.As you can see, your Mac has many ways of telling you that the installation of Mac OS has stalled. Sometimes, you will see a “spinning beach ball”. In some cases, an Apple logo with a loading status bar will show. How to Know If the Installation Has StalledGenerally, if there is a problem with the software installation, it will show on the screen. Download the update from the support website of Apple.If you are still having issues with downloading the update through the Mac App Store, visit Apple’s website instead. Click the Cancel button, and you should be able to restart your download without any problems. Mac tool for screenshotsCheck the Log to know if your Mac is still installing the update.To bring up the Log, press the Command + L keys. So, it’s best that you leave your Mac overnight to complete the installation.Generally, the installation of the updates can take 16 hours or more, and the status bar you see during the installation is only a guess at how long the installation will take. If you are uncertain whether or not your Mac has frozen during the installation, consider our advice below:Before you come up with a conclusion that your Mac has stalled during the installation, you have to be aware of certain things.Sometimes, the High Sierra installation can take very long to the point that it looks frozen already, but when you leave it for hours, the process has eventually completed. Otherwise, you might lose your data when you interrupt the installation process with a forced reboot. Wait for a few seconds and restart your Mac.If you obtained the updates from the Mac App Store, go to the App Store and check Updates. Fixes to a Stuck Mac OS Sierra Installation Once you have checked everything and you are positive that your Mac has completely stalled, follow these steps:Press and hold the Power button to switch off your Mac. It will also give you a better idea of what files are currently being installed.If you think that the installation has not stalled, just be patient and wait for the process to be completed for a few more hours. Once your Mac has restarted, go to the App Store and install the update in Safe mode. This update version will replace all your system files to ensure everything is up to date.To install the High Sierra update in Safe mode, press the Power button and hold down the Shift key. If you visit the website, you can find the Combo update, which contains all the files needed to update your OS. You can also download it from Apple’s website.We highly suggest you get your update from Apple’s website if you are having problems with the installation. If the Log screen shows that there have been no updates, proceed to the next step.As mentioned above, the Mac App Store is not the only place to download the High Sierra update from. It should show what files have been installed and what are pending. ![]() If you have done all the steps above and you are still having installation issues, we suggest you take your Mac to the nearest Apple Store and have an Apple technician check it. It’s also a great idea to install Mac repair app to ensure your Mac is optimized and free of junk files.Hopefully, we were able to give you answers and helped you fix your problems with a stuck Mac OS Sierra installation. Once everything is updated, run Disk Utility.After you have successfully installed High Sierra, we suggest you run Disk Utility to see and correct any issues that might have caused the installation problem. Install High Sierra from an external drive.If you are still having problems with installing High Sierra, you can try installing it from an external drive. But we suggest you select the Install new OS option.While reinstalling your OS, your Mac will replace all the system files and overwrite the problematic ones which may cause the error.
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