This article explains how you can fix the software update problem. More specifically, the focus of this article is on what you can do to when your Mac won’t update to the latest version of macOS.

  1. A list of macOS 10.12 Sierra 'combo' updates macOS 10.12 Sierra Combo Updates For more information on the difference between normal and 'combo' updates including recommended instructions for installing updates see this article. MacOS 10.12.6 Combo Update; macOS 10.12.5 Combo Update; macOS 10.12.4 Combo Update; macOS 10.12.3 Combo Update.
  2. The 10.12.4 Combo updater is available from the usual Apple support downloads page - Here's a link to that page, if for some reason you can't search it out. ( I do remember some reports that the combo updater was not showing at first, but it does now ).

Some Mac users, unfortunately, have been and continue to be affected by various macOS software update issues where they may experience a stalled macOS update. By stalled, we mean that macOS updates won’t download and install successfully.

Sometimes, you may see an error message saying “The macOS installation couldn’t be completed” or “macOS could not be installed on your computer”.

Mac Won’t Update?

The problem is that the updates to 10.12.5 (also tried offline combo update to 10.12.5, 10.12.4 and 10.12.1). All the update reach the reboot phase but the machine stop to update at 17 min left or 10 min left (always 10 min left for update to 10.12.5).

Please try the tips belove if you are unable to update your computer:

It is important that you back up your Mac before you do anything.

There could be a variety of reasons for this. Before you do anything:

  • Make sure there is enough space to download and install an update. If not, you may see error messages. To see if your computer has enough room to store the update, go to the Apple menu > About This Mac and click the Storage tap. You can easily free up storage space on your Mac.
  • If you see a “Update Not Found” error, see this article.
  • Make sure that you have an Internet connection to update your Mac. You can troubleshoot your connection.
  • Be patient. An update may take some time. Just waiting may fix your problem. Sometimes more than a few hours. Do not put your Mac to sleep or closing its lid. Also ensure than your Macbook, if it is a Macbook, it is plugged it into AC power.
  • If the update does not complete, your computer may seem stuck or frozen, for an extended time, try to restart your computer by pressing and holding the power button on your Mac for up to 10 seconds.
  • If you have any external hard drives or peripherals connected to your Mac, try removing them. And try to update now.
  • Reset PRAM on your Mac and then try again. To reset PRAM, turn off your Mac and then turn it on and immediately press and hold the Option, Command, P, and R keys together for about 20 seconds.
  • It is possible that your Mac may unable to reach the update server. There could be two reasons for this:
    • You may have a slow internet connection. You may want to restart your router and modem to fix this problem. If you are using a Wi-Fi connection, try a wired connection, if possible.
    • Or there could be issues with Apple servers. It is possible that Apple servers are overloaded as a lot of people may be trying to update. You can check if Apple servers are experiencing issues.

If you are still having issues, then you may try the followings:

Safe mode

Try updating your Mac in safe mode. Here is how:

  • Startup your Mac in safe mode. To do that, turn off your Mac and then turn on your Mac and immediately press and hold the Shift key until you see the login screen. Then release the Shift key. And login.
  • Now your computer is in safe mode. Try to update now.
  • Then exit safe mode when you are done (in either case). To exit safe mode, restart your Mac normally, without pressing the Shift key.

Combo update

You can use a combo update to install Mac updates. Please note that before you continue, you may want to back up your Mac. You can back up with Time Machine or you can use iCloud.

Please note that combo updates let you update your Mac from a prior version of macOS within the same major release. A combo update is a combined update that means that it contains all of the changes since the original release of that major version. This further means that, using a combo update, you can update from macOS 10.15 directly to Mac OS X 10.15.2, skipping the 10.15.1. But you cannot go from, let’s say, 10.14.x to 10.15.x. For example, using a combo update, you cannot upgrade from macOS Mojave to macOS Catalina.

Please note that combo updates are huge. Here is how you can use them:

Macos Sierra 10 12 Download

  • Visit Apple’s combo updates site:
  • Find the right combo update. And download it. As stated above, they can be huge. The combo will download as a .dmg file.
  • Now quit all apps on your Mac.
  • Double-click the downloaded file, if it does not start automatically.
  • Follow the onscreen instructions.

Using macOS Recovery to update your Mac

If you still could not update, you may try this. To do this, you need to restart your Mac from macOS Recovery. Using the method below, you will be able to upgrade to the latest macOS that is compatible with your Mac. Here is how:

  • Turn off your Mac.
  • Turn on your Mac and immediately press and hold the Option-⌘-R keys together until you see the Apple logo or the spinning globe icon.
  • Login.
  • Click Reinstall macOS and follow the onscreen instructions.

See also: How to fix Catalina update problems

MacOS Sierra is Apple’s desktop Operating System which incorporates a bunch of interesting features. The latest MacOS Sierra 10.12.5 update has been released that improves security, enhance compatibility and stability for Mac systems. MacOS Sierra 10.12.5 offline installer is available to download which helps to install MacOS Sierra on multiple systems without Internet connectivity.

If you are running MacOS Sierra 10.12.4 and want to update your Mac system, you can access either App Store or the MacOS Sierra offline installer links, given in this blog post. After downloading MacOS Sierra 10.12.5 standalone installer, you can perform the installation on your system through iTunes.

All Mac users are recommended to update their systems to the latest MacOS Sierra 10.12.5 update to improve the performance of the systems.

Recommended:Download Apple iOS 10.3.2 Offline Installer for iPhone, iPad and iPod

Download Macos Sierra 10.12 5 Combo Update

Highlights of MacOS Sierra 10.12.5 Update

  • Fixes an issue where audio may stutter when played through USB headphones.
  • Enhances compatibility of the Mac App Store with future software updates.
  • Adds support for media-free installation of Windows 10 Creators Update using Boot Camp.
  • Adds support for more digital camera RAW formats.
  • Resolves an issue, affecting some enterprise and education customers, that may cause the system date to be set to the year 2040.
  • Prevents a potential kernel panic when starting up from a NetInstall image. This fix is available when starting up from a NetInstall image created from the macOS 10.12.5 installer.

Download Macos Sierra

Direct Download MacOS Sierra 10.12.5 Offline Installer

Download MacOS Sierra 10.12.5 Update (Size: 1.5 GB)

Download MacOS Sierra 10.12.5 Combo (Size: 2.0 GB)

Macos 10.12 Sierra Dmg

Download MacOS Sierra 10.12.5 for iMacs (Size: 1.5 GB)

Do share your experience of this latest MacOS Sierra update and if you find any problem while downloading MacOS Sierra offline installer, let us know via comments, we will assist you to resolve the issues.