What to Do If High Sierra Cannot Be Installed Due to an Error?

There are cases when users cannot install High Sierra although their Macs are fully compatible with the latest version of macOS. A message The path /System/Installation/Packages/OSInstall.mpkg appears to be missing or damaged keeps showing up, and an installer is impossible to quit. Restarting a computer does not help as a screen with the same error comes up again.

macos could not be installed
Source: github.com

There are several options to handle this issue.

Safe Mode

Try entering this mode to run the Disk Utility, as the issue can be hard drive related. Turn off your Mac and restart it while holding down the Shift key until an Apple logo appears. Wait until a computer boots up, open Disk Utility and make necessary repairs. Then repeat installing High Sierra.

Recovery Mode

If you cannot use Safe Mode, try to enter Recovery Mode instead.

  1. Hold Command + R keys at the same time after pressing the power This combination is used for reinstalling the latest macOS version that has been already installed on a Mac; yet, it doesn’t upgrade to the most recent macOS version available out there. The startup process is complete when the Utilities window shows up.
  2. Choose Disk Utility first to find internal disk issues if any and repair them.
  3. Then click Reinstall macOS.
  4. Reinstall your previous OS.
  5. Download Installer again and reinstall High Sierra by repeatedly choosing Reinstall macOS on the Utilities
  6. Choose Continue and do what onscreen instructions tell you. Make sure you have your Apple ID.
  7. Click Install and wait until your Mac restarts with High Sierra.
Reinstall macOS
Source: support.apple.com

Finding a Missing OSInstall.mpkg File

You can choose another path and find a missing OSInstall.mpkg file that caused a problem. Enter Recovery Mode and open Terminal. For this, open the Applications folder, and click on Utilities, where you will find the Terminal application. Alternatively, you can use Spotlight search and just enter “terminal.” After launching Terminal, type $ find -f / OSInstall.mpkg | grep OSInstall.mpkg. It may be that this file is located on the recovery, not boot partition. That is why it could remain invisible to the system. If you find it, create the Packages folder in the boot partition and then copy OSInstall.mpkg to /Volumes/Macintosh HD/System/Installation/Packages. Then try reinstalling High Sierra again.

Booting Up from Another Disk

You can try starting up your computer from an external drive or USB with an OS. Then you need to rerun Installer

Worth mentioning that before installing High Sierra, you should back up your data using Time Machine, copying it to external storage device or iCloud. To estimate the amount of space you need, click necessary files or folders and then use a Command + I combination. Also, to find out about how much space is still available, click the Apple menu and choose About This Mac. There you will see the Storage tab.

Then you should check your computer if it is ready for a new OS. It requires a certain amount of space. Otherwise, it will not be installed. You need at least 15GB on your hard drive.

Do not wait until a problem arises to run the Disk Utility. Do it before downloading High Sierra.