Can’t Complete High Sierra Upgrade. What Are the Possible Solutions to the Problem?

Upgrading to High Sierra may be troublesome. Some users say that during the installation the progress bar gets stuck when the process is almost complete, and a Mac gets hot. It is hard to decide what to do: shut a computer down, restart it in the Safe Mode or as usual.

What Is the Optimal Solution if the Installation Seems to Be Frozen?

Problems with installing new system versions happen quite often and are usually pretty manageable even for an average user.

Note: before upgrading to High Sierra, make sure you have enough space on your hard drive (8.8GB or more) and RAM (2GB or more).

If the installation appears to be frozen, the first thing you need to do is to check if it is really stuck, because it may only seem that nothing happens while your computer is just working on a large data segment. A Mac may show the wrong time remaining: 20 minutes may easily turn into 3 hours. It is better to wait as long as you can (for example, you can launch the upgrade at night, so you do not waste your time). Otherwise, you may lose important data.

Therefore, you need to press Command + L to see if the installation is still going on and the approximate amount of time left.

If the system has really failed to upgrade, follow the next steps.

Restart Your Mac

Now you can force restart your computer by holding the power button. Then press it again and repeat upgrading to High Sierra.

Note: if you try to install High Sierra you got from the Mac from Mac App Store, try downloading it from the Apple’s website.

Install High Sierra in the Safe Mode

To enter this mode, press the power button, holding the Shift key at the same time until you see the Apple logo. Then go to the App Store, download the installation file again and retry upgrading to High Sierra.

Reset the NVRAM

If the previous step was not successful, reset the Non-Volatile Random-Access Memory (NVRAM). It is used by the system for storing settings like display resolution or sound volume and sometimes may cause problems with the system upgrade as well.

Important: Turn off the firmware password if you use it before resetting the NVRAM to keep your Mac from starting up in the Recovery Mode.

  1. Make sure you have no external hardware connected to your Mac.
  2. Shut down your computer.
  3. Press the power button and immediately press and hold Option + Command + P + R keys. Do it for about 15-20 seconds, while your Mac is restarting.

Use the Recovery Mode

  1. Press the power button and after you hear the chime press and hold the Command + R key combination.
  2. In macOS Utilities, choose Reinstall a new copy of macOS and click Continue.
  3. Choose Continue again when you see the Installer window.
  4. Select the hard drive you wish the system to be stored on.
  5. Click Install and follow the on-screen instructions.

Install High Sierra from an External Drive

If none of the above methods proved to be a problem solver, try to install High Sierra from your external drive.