PKIInstallErrorDomain Error 106: What You Should Know

Reading time: 4 Minutes

Installing a new version of macOS should be a pretty straightforward task. Your Mac will tell you that there is an available update via the Notification Center. To proceed with the installation, all you have to do is click on it. In some cases, depending on your system settings, the update is already downloaded and needs only your go signal to install.

As seamless as the process may seem, sometimes, users encounter Mac update errors. While some are stuck in the middle of the installation process, others are getting PKIInstallErrorDomain Error 106, particularly when installing the 10.14.4 update.

What Is PKIInstallErrorDomain Error 106?

According to some Mac users, the PKIInstallErrorDomain error 106 appears while trying to update Macs. It often comes with the error message “The operation couldn’t be completed. You can try updating again in System Preferences after restarting.”

There are many possible reasons why the error occurs. Maybe there is not enough space available on your Mac, hence your system is struggling with the installation. It could also be triggered by malware entities or hardware issues.

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So, can the PKIInstallErrorDomain error 106 be the fixed? The answer is YES. As with other Mac problems, it can be resolved using some quick and easy fixes.

What to Do About the PKIInstallErrorDomain Error 106: While Downloading a macOS Update

If the error appears in the middle of downloading a macOS update, here are some solutions to try:

1. Check the Servers of Apple.

Whenever Apple releases an update, people will rush to download it. Oftentimes, this results in problems with Apple’s servers. So, the first thing you should do is check the System Status page of Apple’s site. Verify if there are any known problems.

2. Download the Update Via a Wired Connection.

Downloading a macOS update is quicker if you switch from a WiFi network to a wired connection.

3. Restart the Download.

If you are unable to successfully download the update, cancel the download and restart it. Go to the Mac App Store, locate the macOS version you want to download, and press the Option key. At this point, an option to cancel the download will appear. Click on it.

Once you have cancelled the download, start all over again. Hopefully, there will be no problems this time.

4. Get the Update from Apple’s Official Support Website.

If you cannot download the update via the App Store, you can go to Apple’s website instead. Find the latest macOS update there and download it as you normally would.

What to Do About the PKIInstallErrorDomain Error 106: If the Update Has Stalled

Now, if the update has stalled and the PKIInstallErrorDomain error 106 has surfaced, we suggest that you consider these fixes:

1. Restart Your Mac.

Sometimes, all your Mac needs is a complete reboot and all the errors will be gone. To restart your Mac, press the Power button and select Restart.

2. Visit the Mac App Store.

If you have been trying to install the update from the Mac App Store, open the App Store and select Updates. From there, you can continue with the update or the installation where it left off.

3. Install the Update in Safe Mode.

To start your Mac in Safe Mode, press the Power button while holding down the Shift key. Once it has completely rebooted, go to the App Store and install the update as you normally would.

4. Clear Storage Space.

If the reason why the update failed was that there is not enough storage space available to install the update, then consider deleting some unnecessary files. Though you can do this manually, it’s faster if you install a reliable Mac repair tool that will automate the deletion of junk files on your system.

5. Reset the NVRAM.

Resetting the Non-Volatile Random-Access Memory (NVRAM) often fixes the most common Mac errors. To do it, follow these steps:

  1. Shut down your computer.
  2. Press the Power button while holding down the Command, Option, R, and P keys.
  3. Release the keys until you hear Mac’s startup sound or until the Apple logo appears.

After resetting the NVRAM, you might notice that some of your mouse, volume, keyboard, or time settings are lost. Don’t worry, because it’s normal. Just restore your previous settings manually if you still remember them.

6. Install the Update from an External Drive.

If you are still having issues with installing the update, find an external drive and try to install the update from there. Once you have an external drive ready, follow the instructions below:

  1. Download the update and save it on the external drive.
  2. Turn off your computer.
  3. Connect the external drive to your Mac.
  4. Switch on your Mac by pressing the Power button and holding down the Option key.
  5. Release the keys when you hear the startup tone.
  6. Choose the external drive with the macOS update.
  7. The installation process should now start. Follow the on-screen prompts.

7. Run Your Mac in Recovery Mode.

Recovery Mode is a handy Mac utility that aims to create a temporary boot partition to let users access certain files or apps on their computers in the event that their system freezes or crashes. This mode is also useful when users encounter the PKIInstallErrorDomain error 106.

To run your Mac in this mode, here are the steps to follow:

  1. Check if your Mac is connected to the Internet. If not, make sure to establish a stable connection.
  2. Go to the Apple menu.
  3. Click Restart.
  4. While your Mac is restarting, hold down the Command + R Release them when you hear the startup tone.
  5. Select Reinstall a new copy of macOS.
  6. Hit Continue.
  7. Click Continue again.
  8. Agree to the terms and conditions.
  9. Choose your hard drive from the list.
  10. Select Install.
  11. Wait for the installation process to complete.

8. Seek Help from Experts.

If all else fails, your last resort is to take your Mac to a certified Apple technician. Have them check your Mac for any underlying problems that may have triggered the PKIInstallErrorDomain error 106 to show.

Bottom Line

Although there is no definite fix for the PKIInstallErrorDomain error 106, it’s great to know that some Mac users were able to get through it by simply trying the solutions above.

Let us know which of the solutions above have solved your problem with the PKIInstallErrorDomain error 106. Comment on them below.

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