The MacOS Installation Couldn’t be Completed [Troubleshooting Guide]

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“The MacOS installation couldn’t be completed” can be one of the rare problems you face. As an Apple Mac user, you might have to fix certain errors in the Operating System on your own. Installing few maintenance apps or freeing the space might have been your fixing methods for sure.

But, when it comes to the ultimate relief, you may have to reinstall the MacOS. However, if you get to see the “MacOS installation couldn’t be completed” error, things can be extremely frustrating. This article will let you have the complete guide that requires when you get this error, which includes the reasons and the fixes.

Why Do I see the MacOS installation couldn’t be completed error on my MacBook?

If you see the above-mentioned error, there can be several reasons contributing to that. Not having enough memory is one of the key factors. Most Mac users believe that it is the only reason why computer doesn’t allow the installation of MacOS. But, as an Apple Mac User, you have to be aware of all the possible reasons.

Not having enough memory is the most common reason

Even if you understand the remaining free storage in the computer hard disk, that has to be a daily updating one. It means that, although there was enough memory in the hard disk a couple of hours ago, that space might have filled unknowingly. For example, if you are using the MacOS for internet browsing, the hard disk might fill automatically. Therefore, it is vital to use a cache file cleaner for facilitating the auto disk cleanup, which prevents unnecessary hard disk fillings.

Incompatible hardware combination causes the same problem

Incompatible hardware is another reason for “the MacOS installation couldn’t be completed” issue. Apple is always looking for the most accelerated hardware combination for its OS. Their operating systems get some embracing features from each update they deliver.

To get the most embracing operating experience for the MacOS users, it requires specific set of hardware requirements to fulfill. If you don’t have the hardware requirements up to the expected level, the MacOS installation couldn’t be completed message is inevitable.

Corrupted Files also cause the MacOS installation couldn’t be completed error

This is not just a probable reason only for Apple users, but even Windows users face similar troubles due to corrupted files. If you don’t have a good source to get the installer file (,developers%20create%20uniform%20software%20installers.), you have to download it from the internet. The untrusted parties on the internet may provide additional files, malware, and unnecessary things along with the installer file. This has an impact on the installation process.

Issues in the MacOS startup disk

Booting up usually begins after identifying the startup disk. Although the Windows operating system has several differences from the MacOS, the booting up is more or less the same and requires a typical bootable hard disk. When you have more than one startup disk or have none of the startup disks, you will not get the installation completed. Therefore, it is vital to specify the startup disks when you are about to install the new MacOS on the Apple device.

You can unplug the flash drives connected to the Mac computer. If not, the situation will become worse if you have specified several devices as bootable devices.

Click here to read 8 how-to’s of MacOS Sierra (

What to do before installing the MacOS installer

It is important to conduct few steps before installing to handle errors like “the MacOS installation couldn’t be completed.”

Try the safe mode to avoid errors

If you have got into a loop where the MacOS installation couldn’t be completed, one of the remedies you can try is booting your computer in safe mode. It will keep you out of the error and skip unnecessary bootable sequences that prevent you from getting to the required destination.

Create a backup using the time machine

It is vital to stay in control as much as possible in scenarios like these. The backup option is a helpful; feature that minimizes data loss, that happen after the updates and MacOS installation-like processes. If there is something wrong with either the update or the installation, you will be able to get the computer where it was before the installation.

Compare the Hardware Compatibility

You might not have been aware of the hardware compatibility of your Mac computer because you have never faced issues in the past. When there is not enough acceleration in the hardware compact, the MacOS installation process won’t be a smooth sail. The best way to get rid of the problem is to have an understanding of the update that you are about to install.

Visiting the App Store will let you know what kind of hardware acceleration you need to have when installing the update or the new MacOS version. All you have to do is to view details and compare the required hardware compatibility with your Mac computer.

The MacOS installation couldn’t be completed; what to do?

If the MacOS installation couldn’t be completed, you will have to take a new approach to the installation process, which means you have to follow a new method. Here are few methods that you can try.

Restart the MacOS

Although the Mac operating system is one of the perfect operating systems in the world, it does contain certain errors. As a result of small bugs and errors, you will not be able to complete the installation; a simple restart can be your friend in such situations. 

Leaving enough space on the Mac device 

Although it is an update, you have to leave at least 5GB on the Hard disk for the installation. When it comes to the complete installation of the package, you will have to leave at least 20GB on the hard disk. Since the entire process involves fixing the whole operating system, you have to bother about the remaining space as a certain fact. 

Set the time again

Apple inspects lots of things. The time on your computer is such a thing that they use to identify the user. Errors in the time of your computer won’t allow app installations or updates. Therefore, you have to set the right time to come out of “the MacOS installation couldn’t be completed” error. You can set the time by opening the system preferences and then set the right time.


“The MacOS installation couldn’t be completed” is not an impossible issue to overcome. If you act smartly, the error will be just a matter of a couple of minutes. It is important to note that identifying the cause is as vital as finding a solution for the problem; because you will know how to react if it happens again in the future. If you have any questions, please let us know via a comment. Have a great day!

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