Many users reporting that new Cumulative Update KB3172985 fails to install or stuck midway. Microsoft offers few fixes for this problem.
1. Type ‘Troubleshooting’ in the search. Now select View All in left side panel. Select ‘Windows Update’ at the end of the open window. Run the troubleshooting. Restart your and try to update again.
2. If that doesn’t fix Cumulative Update KB3172985 problem. Simply Download standalone installer and install it by your self.
Download KB3172985 for x86 (501 MB)
Download KB3172985 for x64 (914 MB)
If you have installed earlier updates, only the new fixes that are contained in this package will be downloaded and installed on your computer. If you are installing a Windows 10 update package for the first time, the Cumulative Update KB3172985 for the x86 version is 501 MB and the package for the x64 version is 914 MB.
