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How to Fix macOS Could Not Be Installed Error?

Have you faced a message saying macOS could not be installed on your computer?  Don’t worry it’s not a big issue, you can easily fix it.

“macOS could not be installed on your computer” error is a common error many users can see when they are trying to update  Mac’s operating system, but can’t complete the operation.

It may seem unfixable error. Despite the wording, it doesn’t mean your installation will never work. It just means it failed that one time.

Here’s why this error happens and how to fix it.

Why Does the macOS Installation Error Happen?

macOS installation error can happen for many reasons, here are some messages you might see underneath the warning:

  • “The pat /System/Installation/Packages/OSInstall.mpkg appears to be missing or damaged.”
  • “An error occurred installing macOS.”
  • “Unable to unmount volume for repair.”
  • “Storage system verify or repair failed.”
  • “An error occurred while verifying firmware.”

These messages introduce some information about the error reason every time it happens.

How to Fix macOS Could Not Be Installed on Your Computer Error?

  • The first thing you can do, just Restart and try the installation again. Sometimes a restart is all your Mac needs to sort itself out.
  • Check the Date & Time setting. If the displayed date and time don’t match reality, this could be the problem.
  • Free up space. In some cases, macOS will fail to install because it doesn’t have enough room on your hard drive to do so.
  • Delete the installer. Find the macOS Installer in your Finder’s Downloads folder, drag it to the Trash, then download it again and retry.
  • Reset The PRAM And NVRAM:

The PRAM and NVRAM store various settings and preferences on your Mac, such as your screen brightness, sound volume, and display resolution. Errors with your PRAM or NVRAM might explain why macOS couldn’t be installed on your computer.

Fortunately, it’s easy to reset these settings without erasing any of your personal data. To do so, restart your Mac and hold Option + Cmd + P + R while it powers on.

Keep holding all those keys until you see a second Apple logo or hear a second startup sound, at which point the reset is complete.

  • Restore from a backup: Make sure your backup drive is attached, then restart your computer and hold Command+R until the Apple logo appears. Instead of going to the Desktop, your computer will prompt you to choose the main language, then open a window called macOS Utilities.

In macOS Utilities, click Restore From Time Machine Backup, then click Continue.

You’ll come to an intermediate screen with some information about what you’re about to do. Click Continue to move ahead.

Choose the drive you store your backups to and click Continue again, which will take you to a screen where you can choose your most recent backup. Afterward, click Continue again.

Your computer will restore the earlier backup, and you can see if the installation works.

How to Fix macOS Could Not Be Installed Error?
How to Fix macOS Could Not Be Installed Error?
  • Run Disk First Aid. This may help if you’re getting the “Unable to mount volume” error. First Aid will check your internal hard drive and make any fixes it can. First Aid will check your internal hard drive and make any fixes it can. It may even be able to mount the volume after it’s done. Then you’ll be able to retry the installation.

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