Fix macOS Sierra 10.12.2 Fail to Install/Update Stuck

Tracy King updated on Aug 30, 2019 to Mac File Recovery | How-to Articles

Summary

Cannot download the latest macOS Sierra 10.12.2 and fail to install the latest macOS Sierra 10.12.2 on your Mac? Relax! This article will provide you direct access for you to free download macOS Sierra 10.12.2 and effective methods to fix macOS Sierra fail to install or update stuck error on your Mac. If you have data loss disaster due to macOS Sierra update, just free download EaseUS Mac data recovery software to get all lost Mac data restored now.

How to fix macOS Sierra 10.12.2 fail to install or update stuck error?

Are you having problems to download latest macOS Sierra 10.12.2 and fail to install it on your Mac? Your Mac computer gets stuck while trying to install macOS Sierra 10.12.2? Don't bother anymore. Here in this article, we'll provide you direct access for you to free download macOS Sierra 10.12.2 and methods to fix macOS Sierra fail to install or update stuck error without losing any data on your Mac.

Just follow below-offered guidance to fix macOS Sierra 10.12.2 fail to install issue and install latest macOS update on your Mac right now.

Step 1. Backup important Mac data in advance
Step 2. Download and install macOS Sierra 10.12.2 update
Step 3. Fix macOS Sierra 10.12.2 fails to download or download stuck error
Step 4. Solve macOS Sierra 10.12.2 fails to install or update stuck error
Extra Tip: Restore lost data after macOS Sierra 10.12.2 update

Now let's start fixing macOS Sierra update stuck or fail error and get the latest macOS system downloaded and installed on your Mac with those guide now.

Step 1. Backup important Mac data in advance

It's highly recommended for you to apply Time Machine as a free tool to full backup your important Mac data with simple clicks so to avoid data loss issue on Mac due to macOS update.

  • Connect external hard drive with Mac and launch Time Machine on Mac;
  • Turn Time Machine slider ON > Select Backup Disk to set external hard drive as backup destination;
  • Select important data to backup now.

Professional Mac data recovery software is an alternative software for you to restore lost data due to macOS Sierra 10.12.2 update if you don't have any backups.

Step 2. Download and install macOS Sierra 10.12.2 update

You may follow below guide to download macOS Sierra 10.12.2 beta update:

  • Go to developer.apple.com > Tab Develop > Click on Downloads;
  • Log in with your developer account > Scroll down and click Download button for macOS Sierra 10.12.2;
  • Sign in with developer account - username and password > Click Redeem to download the beta on your Mac then.

Now you can directly run downloaded macOS Sierra 10.12.2 on your Mac computer or device. If you cannot complete the update process or fail to install downloaded update on Mac, don't bother. In Method 3 and 4, we'll provide effective solutions for you to fix this error.

Step 3. Fix macOS Sierra 10.12.2 fails to download or download stuck error

If you failed to download macOS Sierra 10.12.2 by the above offered guide, or get stuck with error message "An error has occurred", just follow below tips to fix it now:

  • Open Launchpad > Delete "Install macOS Sierra" file with a question mark on it;
  • Reboot Mac and retry to download a new macOS Sierra update 10.12.2: Click Apple Menu  > Select App Store > Click Update next to macOS Sierra in the Update section.

Step 4. Solve macOS Sierra 10.12.2 fails to install or update stuck issue

Here you'll get two major solutions to fix macOS Sierra 10.12.2 fails to install or update stuck error:

1. Install macOS update in Safe Mode to fix macOS Sierra 10.12.2 update stuck error

  • Disable or uninstall any Anti-virus software on your Mac;
  • Ensure Mac computer has a proper and reliable internet connection;
  • Install macOS Sierra in Safe Mode: Hold Power till Mac shuts down > Turn Mac on and hold Shift key > Release Shift when Apple logo appears > Then Mac shall be booted into the Safe Mode.

2. Clean install macOS Sierra 10.12.2 to fix macOS fails to install issue

To complete clean install of macOS Sierra 10.12.2 on Mac, you may need to do some pre-install preparation jobs:

Create a bootable installer

  • Download macOS Sierra 10.12.2 installation package from Mac App Store;
  • Connect a new USB drive with Mac > Open Disk Utility in Applications/Utilities folder > Select thumb drive in sidebar and click Format;
  • Name USB as Untitled > Choose OS X Extended > Click Erase > Open Terminal once USB is formatted and finish downloading macOS Sierra;
  • Ensure USB named Untitled is connected to Mac > Type follow command in Terminal and hit Enter:

   sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/SierraBootInstall --applicationpath /Applications/Install\ macOS\ Sierra.app --nointeraction

  • Enter Administrator password if necessary, command will create a bootable Sierra installer on USB drive then;

Now you can start a clean installation of macOS Sierra 10.12.2 on Mac now:

  • Connect USB bootable drive on Mac and restart Mac by holding Option till you hear the reboot tone;
  • Select disk called Install macOS Sierra in the drive list that appears on screen;
  • Once USB drive is booted, select Disk Utility > Choose Mac's startup from the list > Click Erase;
  • Once Mac's startup disk is formatted, return to Utilities window and select Install macOS > Choose just erased startup drive to install macOS > Follow onscreen prompts to complete the installation.

Extra Tip: Restore lost data after macOS Sierra 10.12.2 update

Professional Mac data recovery software - EaseUS Data Recovery Wizard for Mac allows you to restore all lost data due to macOS update or other reasons within 3 steps. If you lost any data while installing macOS 10.12.2, just download it and let it help get all lost data backup now:

Step 1. Where was data lost after operating system update? Choose the location and click Scan.

select the location where data lost after operating system update and click scan

Step 2. EaseUS Data Recovery Wizard for Mac will immediately scan your selected disk volume and display the scanning results on the left pane.

scan the selected drive to find lost data

Step 3. After the scan, select the target files that were unknowingly lost during or after the update and click Recover Now button to get them all back.

click the recover now button to recover lost data after the operating system update

 
 

100% of people found this article helpful.

 

Frequently Asked Questions

1. Why cannot I recover 2GB data for free?

It is recommended to check the version installed is Free or Trial because they are different versions.

Trial has data preview function but cannot save any files, while the Free version enables to recover 2 GB files. The default free space is 500 MB and you may share the product on social media to get another 1.5 GB.

2. Why cannot the recovered files be opened?

A file is saved as 2 parts on the storage device: directory info (which is comprised by file name, time stamp and size info, etc.) and data content.

If the files with original file names and folder structures cannot be opened, one possible reason is the corrupted directory info. There is still a chance to recover the data content with the RAW Recovery method in our software.

3. Why isn't it suggested to recover the files back to the original drive?

The storage structure of the lost files would be altered or damaged by any changes on the drive. If you save the recovered files back to the same drive, the original data structures and data content would be corrupted or overwritten, which causes permanent data loss. So you should prepare another disk to save the files.

4. How can I check whether my data is recoverable or not before purchase?

The Free version helps you save 2GB files, so verify the recovery quality of our product before purchase.

5. How long does it take to scan the drive?

It strongly depends on the capacity of your hard drive and the performance of your computer. As reference,most drive recoveries can be completed in around 10 to 12 hours for a 1-TB healthy hard drive in general conditions.

About Data Recovery Wizard

It's super easy to recover 250+ types of files after deletion, disk formatting and virus infection. Click the links and compare the difference of each version.