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A cumulative update is a Windows update that contains a bunch of previous updates bundled as one. It’s useful when you haven’t updated in a while because it lets you jump to a certain Windows milestone (like the Anniversary Update 9 Windows 10 Anniversary Update Features You'll Love 9 Windows 10 Anniversary Update Features You'll Love Are you still on the fence about the Windows 10 Anniversary Update? We have summarized the most important new features. Be sure to try all of them if you've already upgraded! Read More ) without installing those past updates one by one.

Unfortunately, cumulative updates can be tricky as evidenced by Cumulative Update KB3189866, which, according to user reports, can get stuck at numerous points throughout the update process — namely at 45%, 46%, 48%, 49%, and 95%.

If you’re trying to install this cumulative update but progress keeps halting at one of those percentages, there are three potential fixes you should try. Go at them in this order:

  1. Run the Windows Update Troubleshooter — This is always the first step you should take when trying to resolve problems with Windows Update How to Resolve Windows Update Problems in 5 Easy Steps How to Resolve Windows Update Problems in 5 Easy Steps Has Windows Update failed you? Maybe the download got stuck or the update refused to install. We'll show you how to fix the most common issues with Windows Update in Windows 10. Read More . Access it by searching the Start Menu for Troubleshooting, then under System and Security, click Fix problems with Windows Update.
  2. Clear the SoftwareDistribution folder — You can find this directly inside the C:\Windows folder (or whichever drive to which you installed Windows 10). Simply select all of the files in the SoftwareDistribution folder and delete them.
  3. Download the update directly — Through the Microsoft Update Catalog, you can manually download the setup files for various Windows updates. In this case, download the one for KB3189866 and run it: 32-bit installer and 64-bit installer.

If none of those steps work, feel free to leave a comment down below and let us know what kind of errors you’re running into. If one of the steps do work, please let us know which one!

  1. wiel
    September 20, 2016 at 5:16 pm

    Ik krijg een melding na het fout rapport van service registratie ontbreekt of beschadigt.

  2. Marc D Johnson
    September 19, 2016 at 6:28 pm

    Was stuck at 45% - did #3 and downloaded it directly and installed it and that took care of it.

    • Joel Lee
      September 20, 2016 at 1:03 am

      Awesome, glad to hear one of the solutions worked! Thanks Marc.

  3. JAD
    September 19, 2016 at 4:32 pm

    I didn't have any issues with this update but the Anniversary update stalled for me in a very similar manner (I left it at 75% then 95% for a cumulative 2 days !!). The cure I found that worked for me was to restart the machine (not something I did without consideration in the middle of a Windows update) where it automatically rolled back to the last working install. Then log in and start MSConfig using Win+R and select the service tab and hide all the MS services using the tick box below and then click the disable all for the remaining [non-MS] services. I also went onto the Startup tab in Task Manager (Ctrl+alt+escape) and disabled antivirus and Defender). Then search again from Windows Updates at which point on the second scan it picked the update - then installed in within 2 hours without any hesitations as before. Once installed just go back and check all the non-MS services are again active and that your AV/Defender are back on auto startup.

    I am assuming this rather draconian fix will work with this update also.
    Now if only we could convince MS to let us run what we want on W10 without auto-uninstalling it or badgering us that it has been disabled I'd be happy again !

    • Joel Lee
      September 20, 2016 at 1:02 am

      Wow, that sounds complicated. I'm glad it worked for you but it's terrible that you (and others) had to jump through so many hoops just to update Windows 10. When will they get it together? Thanks for sharing, JAD.

  4. Paul Harris
    September 19, 2016 at 3:29 pm

    We can't install some updates because other updates are in progress. Restarting your computer may help, and we'll keep trying to update.

    I tried everything in your article above, and nothing works.
    I downloaded the Anniversary ISO, and that doesn't work either.
    UBUNTU is starting to look better everyday.
    Windows updates have never worked well for me.
    To update to Windows 10, I had to re-install Windows 7, then update.
    I guess I will remain on version 1511, til I buy a newer computer.

    • Joel Lee
      September 24, 2016 at 7:14 pm

      Wow, that sounds like a huge pain. Sorry to hear that, Paul. These kinds of issues are definitely going to, like you said, drive people away -- if not to Linux, then maybe even Mac.

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