Fix macOS Sierra 10.12.2 Fail to Install/Update Stuck Error

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Are you running into the macOS Sierra 10.12.2 update stuck bug? Use one of the fixes our experts recommend to repair the error and successfully update macOS.

Apple is good at releasing updates for Mac computers but when people start experiencing this type of error, it prevents them from enjoying the new features that these updates bring. macOS Sierra 10.12.2 update stuck is frustrating and it’s known to cause data loss too. Fixing the error isn’t dreadfully tedious and the fixes we’re going to show you will help. On top of that, AnyRecover is ready to help restore files that the error may have caused.

Step 1: Back Up Your Mac Data in Advance

Firstly, before attempting to repair macOS Sierra 10.12.2 fail to update, you must back up your data. Most people are inclined to skip this since they believe data loss won’t happen, but this is crucial and more common than they think.

  • Step 1. Get a USB memory stick and connect it to the Mac computer.

  • Step 2. Run the “Time Machine” app and click “Select Backup Disk…”.

  • Step 3. Choose the external storage device you connected, check “Encrypt backups”, and click “Use Disk”.

Time Machine will then format the storage device so that it is encrypted and compatible with Mac systems. Since the device is erased, the current files stored on it should be copied elsewhere beforehand.

Step 2: Free Up Storage for Updating macOS Sierra 10.12.2

An additional step to take prior to the installation of macOS Sierra 10.12.2 is making sure there’s enough free storage. Including having enough free storage, there are three requirements for updating Mac versions:

  • 1. A minimum of 2GB of RAM must be available.

  • 2. Roughly 8.8GB of storage should be free.

  • 3. The Mac has to have 50% battery life or more.

Most modern laptops have more than 2GB of RAM therefore that shouldn’t be an issue. If storage is a concern then consider deleting old files or moving larger files to a USB flash drive temporarily, perhaps even upload files to a cloud storage platform too.

Although 50% battery is required, it’s worth continuing to charge the laptop the whole time just in case the update takes longer than expected.

It’s important to not skip this step. Insufficient storage space can cause the system update to fail and possibly corrupt data, and if the battery dies the update could stop abruptly and brick your Mac.

Step 3: Download and Install macOS Sierra 10.12.2

Now that we’ve got a backup of your files it’s time to actually initiate the update. To ensure this is done properly and reduce the chances of macOS sierra 10.12.2 fail to update, follow these steps:

  • Step 1. Open the Safari app and download either the Normal or Combo update file for macOS Sierra 10.12.2.

  • Step 2. After the download completes you can run the update files and the Mac will take care of the rest.

To deter confusion, the combo update enables Mac users to update from several earlier versions. For example, updating normally would update the system from macOS Sierra 10.12.1 to 10.12.2.

With the Combo Update, you can update from earlier versions like macOS Sierra 10.12.0 to 10.12.2 without experiencing errors.

Step 4: How to Fix macOS Sierra 10.12.2 Fails to Download Error

Following on from Step 3, a download error may have occurred which doesn’t let you actually obtain the macOS files. In this situation, try doing this:

  • Step 1. Go to the Launchpad menu and delete the macOS file named “Install macOS Sierra”.

  • Step 2. Turn your Mac computer off and back on.

  • Step 3. Repeat the part of Step 3 to download another copy of the macOS Sierra 10.12.2 update file.

  • Step 4. Press the Apple menu icon, go to the App Store, and click the “Update” button beside macOS Sierra.

Hopefully, this resolves any download errors you experience, but this isn’t the only problem users have reported.

Step 5: How to Solve macOS Sierra 10.12.2 Fails to Install or Update Stuck Error

Once the OS files are downloaded, the real issue is with the installation. Some Mac owners have reported that macOS Sierra 10.12.2 fail to update and fixes they try have no success.

1Install macOS Update in Safe Mode

First, we suggest that you try running macOS in Safe Mode if this error occurs. This limits the system to run only the essential firmware and drivers.

  • Step 1. Temporarily disable any antivirus software you have installed on the Mac computer.

  • Step 2. Put the Mac into Safe Mode by holding the power button to turn off the computer and turning it back on.

  • Step 3. As the is loading, hold down the shift key until an Apple logo is displayed (when you see this logo you can release the key).

  • Step 4. This indicates that Safe Mode is enabled and you can now run the macOS Sierra 10.12.2 update files again.

By following these steps you can discover if your antivirus software or any drivers are stopping the update from installing.

2Clean Install macOS Sierra 10.12.2

A more aggressive solution would be to do a clean install with the macOS Sierra 20.12.2 installation file. Instead of updating the Mac firmware, this wipes the current operating system installation rather than updating it.

  • Step 1. Connect a memory stick to the Mac and go to “Applications > Disk Utility”, click the memory stick, and select “Format”.

  • Step 2. Rename the device to “Untitled”, select the “OS X Extended” option, and click “Erase”.

  • Step 3. Download the installation files for macOS Sierra 10.12.2 if you haven’t already done so. Then open the Terminal application and enter the command as follows:
    sudo /Applications/Install\ macOS\ --volume /Volumes/SierraBootInstall --applicationpath /Applications/Install\ macOS\ --nointeraction

  • Step 4. Submit the computer’s admin password and wait whilst a bootable device is created.

  • Step 5. Next, hold the Option key until the computer reboots and once it reloads, choose the bootable device “Install macOS Sierra”.

  • Step 6. When the Mac loads, go to “Disk Utility”, select the startup disk, and choose “Erase”.

  • Step 7. Finally, after the erase is complete, go back to Disk Utilities and click “Install macOS” and choose the disk you just erased. The remainder of the installation will be shown onscreen.

If, after trying Safe Mode, the update fails again, a clean install is a definite solution. Be warned that this wipes all your personal data so backing up anything you do not wish to lose is a requirement.

Extra Tip: Recover Lost Data After Updating macOS Sierra 10.12.2

Now that you’ve managed to get around the macOS Sierra 10.12.2 fail to update error, a new problem needs to be solved: getting back lost files. It’s not uncommon for files to be lost with this error and AnyRecover is the best program to help you with the recovery.


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Features of iMyFone AnyRecover:        

Recover any file type lost after updating macOS Sierra; photos, videos, audio, documents, and more format types.

Files that were corrupted from updating macOS, overwritten, or lost, can all be recovered.

Restore lost files from macOS update errors without a professional’s help.

Preview all the lost files on the Mac computer before selectively restoring.

AnyRecover is capable of recovering data in any situation (not just macOS errors).

Users can recover data lost on their Mac, external hard drives, and SD cards.

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How to Recover Lost Files with AnyRecover:

Step 1. Download and install AnyRecover. Run it and choose “All-Round Recovery”.

anyrecover home mac

Step 2. Choose a location to scan for lost data either from the list or by clicking “Browse”.

all round location mac

Step 3. Next, select the file types that you want to scan for. When you are ready to proceed with the recovery, click the “Scan” button.

all round recovery select file type mac

Step 4.When the scan finishes, all of the detected files that were lost or deleted will be displayed. Browse the folder view and select the data lost from macOS Sierra update stuck. Click “Recover” to select a new folder to restore the files to and the recovery is complete.

all round recovery scan complete mac


Situations like this are a perfect example of why taking backups of sensitive files is important. Errors can come out of nowhere and a safe backup can prevent permanent loss. If there isn’t a backup available when macOS Sierra 10.12.2 update stuck occurs, you can use AnyRecover. This is by far the top data recovery program. It performs better than most solutions, is greatly effective, and you won’t be disappointed.

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By  Simon Marcus , to Hard Drive Recovery

Updated on May 28, 2020

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