How to Fix Cummulative Windows 10 Update KB3189866 Stuck at 45%?

What causes How to Fix Cummulative Windows 10 Update KB3189866 Stuck at 45%?

Update gets stuck at 45%
Startup components may be corrupted
Files in Software Distribution folder may be causing issues
Network services related to updates may be stopped

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Do you know what the matter with KB3189866 cumulative Windows 10 update is? When I attempt to run the upgrade, it gets stuck at 45% and doesn‘t go any further.

Less than a week ago, Windows reported about the release of three Cumulative Windows 10 updates - KB3189866, KB3185614, and KB3185611. These updates have been developed to improve the functionality of Windows 10 Version 1607 and decrease its vulnerabilities. The two of them are working properly. However, Cumulative Update KB3189866 for Windows 10 appeared to be problematic since lots of users reported it for getting stuck midway (around 45%). Unfortunately, but usually it does not refreshes and have to be forced-closed. Luckily, specialists have already indicated what steps can be taken in order to fix KB3189866 update error.

How to fix Stuck Cumulative Update KB3189866 for Windows 10?

Yes, we admit that all Windows 10-related bugs are more than irritating. Usually, they cause the system to stuck, slow down, restart, etc., which is why you may even lose a some important work your were currently working on. Unfortunately, but there is no operating system developed that has never encountered an error. The most important thing is that specialists develop threads and inform people how to fix KB3189866 errors and similar issues ASAP. Thus, in this post, we will explain what should be done to fix stuck Cumulative Update KB3189866.

Fix 1. Re-run the update

Right-click on the Win key, select Command Prompt (Admin), and click OK.
Type Dism /Online /Cleanup-Image /StartComponentCleanup in the run dialogue box, and hit Enter afterwards.
This command will automatically fix startup components.
Finally, re-run KB3189866 update.

Fix 2. Delete files from Software Distribution

Right-click on the Win key and select Command Prompt (Admin).
Type net stop bits and net stop wuauserv commands in the run dialogue box and hit Enter after each of them.
After that, close the Command Prompt window.
Hold Win key and while holding it press R key.
Type C:\Windows\SoftwareDistribution and click OK.
Make sure that you delete all files stored in Software Distribution folder.
Finally, download KB3189866 update manually and try to run it one more time.

If these two fixes did not help, then the only thing that you can do to run KB3189866 update successfully is to wait. When it gets stuck at a certain percentage, leave your PC for several hours and it might be that you find the update process completed.

Bottom line

To fix the stuck Cumulative Update KB3189866, you can re-run the update using the Command Prompt to clean up startup components or delete files from the Software Distribution folder. If these steps do not resolve the issue, consider downloading the update manually.

Frequently asked questions

What should I do if the Windows 10 update KB3189866 is stuck at 45% during installation?

Try restarting your computer and then attempt to install the update again. If the issue persists, you can use the Windows Update Troubleshooter to resolve potential problems.

How can I manually download the KB3189866 update if it's stuck at 45%?

Visit the Microsoft Update Catalog website, search for KB3189866, and download the update manually for your Windows 10 version. Once downloaded, run the installer to complete the update process.

Is there a way to reset Windows Update components if the KB3189866 update is not progressing?

Yes, you can reset Windows Update components by running commands in the Command Prompt as an administrator, including stopping the Windows Update service and deleting temporary files. After resetting, try updating again on Windows 10.

Did this fix work for you?

Written & verified by

Jake Doevan

Senior Windows Technician

Windows repair tools SFC and DISM Startup failure recovery Windows Update errors System Restore

Jake Doevan is a senior Windows technician with deep practical knowledge of Windows' built-in repair and recovery tools. He has written extensively about SFC, DISM, CHKDSK, System Restore, and Windows Recovery Environment — the tools that can salvage a failing Windows installation without data loss. Jake's guides are precise and sequenced: each step is ordered to avoid compounding the original problem, and he explains what each command does so readers understand the process rather than following it blindly. His work is particularly valuable for users dealing with corruption, startup failures, and update-induced regressions.

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