Have you ever tried updating to macOS Mojave, and then the installer returns with the message “An error occurred installing macOS” after running for a few minutes?
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In another case, you might find that your MacBook suddenly becomes unresponsive after installing Mojave, taking so much time performing otherwise simple tasks. The show ends with the spinning beach ball of death appearing, staying for a few minutes.
Know that you’re not alone – the macOS Mojave install error has happened to a number of users, and it doesn’t take a lot for them to realize that the problem is likely related to the OSInstallerSetup and the whole process of migrating to Mojave in general. This article aims to be your quick guide to navigate this problem and address it in no time.
The macOS Mojave install error has been identified as a hardware failure in some instances, given the user’s inability to reinstall the operating system despite following the reinstall procedure correctly. Some users, for example, have received this mac error message while attempting to reinstall: “com.apple.OSInstallerSetup.error error 702.”
Below are some quick steps you can follow to solve this issue. Before going further, however, make sure that your computer is in generally good shape. A reliable third-party tool such as Outbyte MacRepair can scan it for all types of junk, optimize your RAM, and eliminate space hogs safely in order to help you proceed with the troubleshooting efficiently.
Let’s get to work and try the following steps to address the problem:
To do this, disconnect any external device from your Mac computer, such as audio devices, an external hard drive, and other peripherals. Next, try to install the software using a new user. Here are steps to create a new account for testing:
Once done, delete the installer file and then re-download it from the Mac Store.
If the issue still happens while you’re in the new account, then that means there’s something actually going on. At this point you can try the succeeding steps.
Are you sure that your software is up to date? If you’ve already upgraded to Mojave, keep it up to date by following these steps:
If your Mac is up to date according to Software Update, then that means all macOS apps are also up to date, including Safari, Books, iTunes, Messages, Calendar, Mail, FaceTime, and Photos.
You can also get updates for earlier macOS version such as High Sierra, Sierra, and El Capitan by following these steps:
It’s also worth trying the Safe Mode option to resolve the issue. Also known as safe boot, it’s a way of initiating your Mac in a way that certain checks are done and the software is barred from automatically loading or opening. It can verify your startup disk and try to repair directory issues, as well as delete font cashes, kernel cache, and other system cache files.
Follow these steps to start up in safe mode:
Now, try to install the macOS update in safe mode.
Apple Diagnostics assists you testing your machine for hardware issues. Once you have isolated the issue as a possible hardware problem, you can follow these steps:
Is it a software issue bugging your system and resulting in the macOS Mojave install error and subsequent problems with using your computer? Follow the instructions on this Apple Support page to address the issue depending on whether it occurs in just one app, in different apps, or in Mac OS X.
Here are the steps to follow to create a bootable Mojave installer:
sudo /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia –volume /Volumes/[YOUR DRIVE NAME] –applicationpath /Applications/Install macOS Mojave.app
It’s time to clean-install macOS Mojave on your Mac. Before proceeding, make sure to back up your Mac to keep your important files. Continue with these steps:
If you’ve tried the solutions above but the macOS Mojave install error persists, perhaps it’s time to contact Apple Support or seek professional service. Follow the steps here. Make sure to also do the steps above correctly to prevent new problems from popping up.
Have you encountered this error before? What solved the issue? Let us know in the comments!