How to fix
KB3189866 update bug
on Windows

KB3189866 update on my Windows 10 get stuck on 45 or 95 percent and just won’t continue to install! I rebooted the PC and cleared the cache, but that did not get things going. How do I fix this bug?

While some Windows users are enjoying the newest Windows 10 features, others are struggling to get their OSs running smoothly. One of the problems that has become a frequent topic of discussion on Microsoft and other tech forums is the KB3189866 update error. The users report that the cumulative Windows update cannot be installed due to the bug which freezes the update at the 45 or 95 percent mark. Microsoft has not yet confirmed this bug officially, so you won’t find any verified solutions how to fix it on their support website or forums, nor will this problem be fixed with the newest patch. Nevertheless, we do not recommend looking for the ways to bypass this issue yourself either. This may negatively impact your computer's performance or even damage the operating system. Also, do not trust the tech forum users who claim to have found the “perfect solution” to fixing this issue because what worked for them may not work for you. In fact, it can even make the matters even worse.

After analyzing the KB3189866 update error, it was discovered that this patch works perfectly if downloaded from the Microsoft Catalog directly. This suggests that the problem may be embedded in the automatic update code itself, and Microsoft should tackle this issue soon. In the meanwhile, you can fix this bug by downloading the KB3189866 patch manually. You can download them directly by clicking the following links:

KB3189866 x64 (431MB)
KB3189866 x86 (255MB)

These links are secured and will link you directly to the Microsoft’s servers where these updates are stored. Alternatively, you can visit the Microsoft Update Catalog yourself and locate the required patch.