A fix issued this past Tuesday to address problems in the Anniversary Update to Windows 10 hasn't fixed the problem and is causing just as many issues with users, according to online reports.
Cumulative update KB3194798, issued on Oct. 11, is failing to install on a number of computers for no particular reason. This update was supposed to repair systems running the Windows 10 Anniversary Update (version 1607) and offer performance improvements and optimizations, as well as bug fixes to the OS.
It's not doing any of those things for some people.
What users see
This update is suffering from the same issues that affected previous cumulative updates. After attempting to install the update, a message pops up that the install failed and the operating system is undoing changes. The system reboots and users are brought back to the desktop where they are asked to install the update again.
Complaints from users on the Microsoft support board have piled up in the last several days, with all of them noting the same problem as described above. Someone posted a link to a Registry update utility, but other people are still having the problem.
As of this morning (Oct. 17), there is still no fix. So, if you have not rolled out this patch yet, consider holding off until possibly next Patch Tuesday.