Overview: There are a lot of Mac users who are facing problems in installing macOS Mojave. We have come across an error like “An error occurred installing macOS” or “An error occurred while preparing the installation, try running this application again” or “macOS could not be installed on Your computer” or “This copy of the install macOS Mojave.app application is damaged and can’t be used to install macOS” or “An internal error occurred while preflighting your volume for APFS conversion”. Do not worry be it any error message we will get the macOS Mojave installed on your Mac.
So, let’s start with the real user’s practical scenarios!
Practical Scenario 1: macOS Mojave install error
Hi Everybody, I am trying to upgrade my 2018 MacBook Pro 13″ from High Sierra to Mojave, but it says “An error occurred installing macOS” at the very end of the installation. I’ve tried to reset SMC, VRAM, Safe mode, Recovery mode and reinstall Sierra. Still not working. Can any1 help me?
Source: Apple Forum
Practical Scenario 2: “An error occurred installing macOS” Mojave Upgrade
Hello, I am trying to upgrade my 2018 MBP from High Sierra (latest) to Mojave. However, the installer returns “An error occurred installing macOS” error after running for about 10 minutes.
Source: Apple Forum
Just like the above two users, there are many Mac users out there who are facing this issue. Please follow the below steps to install Mojave successfully.
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Solution 1) Check the Compatibility
Choose About This Mac from the Apple menu.
You can upgrade to macOS Mojave from OS X Mountain Lion or later on any of the following Mac models. Mac needs at least 2GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier.
MacBook introduced in early 2015 or later
MacBook Air introduced in mid-2012 or later
MacBook Pro introduced in mid-2012 or later
Mac mini introduced in late 2012 or later
iMac introduced in late 2012 or later
iMac Pro (all models)
Mac Pro introduced in late 2013, plus mid-2010 or mid-2012 models with a recommended Metal-capable graphics card.
Once you know your Mac is compatible open the macOS Mojave page on the App Store: Apple Sore Then click the Get button to download.
Once the download is complete installer will open up automatically. Click Continue and follow the onscreen instructions.
Solution 2) Disable or Uninstall Anti-virus software.
Sometimes antivirus installed on the mac fails the installation so disabling it while downloading and installing macOS Mojave will be a good idea.
Solution 3) Create a New Administrator Account
Steps are shown below
Select the Apple menu and click on System Preferences
Select User & Groups
Click the lock icon located in the corner, enter an existing administrator account user and password to open preference panel
Click the + plus icon to create a new account
Bring down the drop-down menu next to New Account and select Administrator
Enter all the details for the new Administrator account like full name, account name, password, and a password hint, then click on Create User to create the new Administrator account.
Now login with the newly created administrator account and download the Mojave installer once again from Apple app store as mentioned in Solution 1. It should install successfully this time. If you receive any error then disable the firewall by going to System Preferences > Security & Privacy > Lock button in the bottom left > Turn Off Firewall
Once installation completes, you will be logged in to a newly created administrator account. You can log out and log back into your usual admin account, and you can delete the other account and its home folder if you wish to.
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Solution 4) Use Macintosh HD the Main Drive to Install Mojave.
In case you have two and more hard drive in your computer, please select the main drive (Macintosh HD) to install the macOS Mojave.
Solution 5) Connect to a Wired Connection
Make sure that internet connection is not disrupted during the download of macOS Mojave. With Wi-Fi connection, it is highly expected to lose connection so switching to wired connection would be wiser.
Solution 6) Install macOS Mojave from USB flash drive
Performing a clean installation will help you get the latest macOS Mojave without any issue. Please note that you will lose all your data on the Mac. Visit this link to perform the clean installation: Apple link How to create a bootable installer for macOS
Wrap Things Up
I hope this post helped you to install macOS Mojave successfully on your Mac system.