Fix macOS Sierra 10.12.1 Update Stuck Error without Data Loss

1Cancel and Re-download macOS Sierra 10.12.1 Update Pack

Step 1: Find the software you are downloading. Hold and press Option and Alt keys. Click the Cancel option to cancel a Mac update in progress.

Step 2: Visit the Mac App Store or the Apple Support site. Search the macOS Sierra 10.12.1 update.

Step 3: Download and install the macOS update again.

Step 1: Visit https://www.apple.com/uk/support/systemstatus/ to access Apple System Status page.

Step 2: Find macOS Software Update in the list.

Step 3: Check the icon’s color. If the icon is green, it means the macOS Sierra 10.12.1 update error is not caused by Apple’s server.

The Mac installation error can be caused by the shortage of startup disk storage space too. In another word, you need to leave enough storage space to fix macOS Sierra 10.12.1 update stuck error. You can delete some large files manually, like previous downloaded movies, inactive software and more.

By the way, you can use Mac cleaning software to delete junk files completely.

Make sure there is at least 2GB memory and 8.8GB storage space. Moreover, you need to leave more than 50% battery on your Mac computer. It would be better if you plug Mac into a power source.

Otherwise, your Mac may freeze during the macOS Sierra 10.12.1 update.

Step 1: Long press Power to shut down your Mac computer.

Step 2: Power on Mac while holding the Shift key on your keyboard.

Step 3: Release Shift when you see the Apple logo on the Mac screen.

Step 4: Sign into your account in the login window.

Step 5: Reinstall macOS Sierra 10.12.1 update in Safe mode to fix Mac OS update failed errors.

Note: The minimum storage space requirement is 9GB for booting Mac in Safe Mode. 

Step 1: Click any empty space on the desktop. Hold and press Command, Shift and G keys simultaneously. 

Step 2: Type /Library/Preferences/SystemConfiguration/ in the “Go to Folder” window. Then press Enter to go ahead.

Step 3: Search and deleted those files
com.apple.airport.preferences.plist
com.apple.network.identification.plist
com.apple.wifi.message-tracer.plist
NetworkInterfaces.plist
preferences.plist

Step 4: Reboot Mac and restart the Wi-Fi router to fix macOS Sierra 10.12.1 update stuck or fail to download error.

If you delete the data accidentally, you can also use FoneLab Data Retriever as a Recycle Bin Data Recovery to get the lost data back with ease.

Data Loss always comes with Mac update stuck errors. During this time, you can run FoneLab Data Retriever to recover deleted or lost Mac files without backup. The powerful Mac data recovery software can help you get back videos, music, documents, emails and many other files due to macOS Sierra 10.12.1 update failures. And it also can be your hard drive data recovery, hard drive partition data recovery and more.

Compared with the traditional Time Machine backup and restore method, you can get more customizable filters to scan and recover lost data on Mac. To be more specific, you can recover lost data after macOS Sierra update without overwritten safely and quickly.

So calm down when you cannot find important documents, you can turn to FoneLab Data Retriever for help.

1. Recover deleted or lost images, audios, videos, emails, documents and other files in various formats.
2. Recover lost and existing data due to deletion, update stuck, formatted partition, RAW hard drive and other data loss errors.
3. You can recover data from Windows, Mac, memory cards, flash drive, hard drive, digital camera camcorder, etc.
4. Offer Quick Scan and Deep Scan modes to find your file effectively.
5. Available for Mac 10.7 and above versions (macOS Mojave included).

These are all workable methods to fix macOS Sierra 10.12.1 update stuck error. Remember to have a copy of important Mac files before updating. If you forgot to make a backup, you can also run FoneLab Data Retriever to recover any Mac data with ease.

You can also learn more about how to fix Macbook Pro shuts down randomly, recover Mac data external hard drive read-only, USB flash drive not showing up on Mac and more easily and effectively.