Last week, Microsoft released Cumulative Update KB3194496 for users running Windows 10 Anniversary Update (version 1067), and, this caused problems for some users - trapping them in a loop after the installation failed. The issue only affected those who were previously on the Windows Insider Program before migrating the the public branch earlier this year, as well as some users still on the Windows Insider Program , Microsoft has now come out with a fix.
ZDNet reports that an email statement from Microsoft confirms that the update released for Windows 10 version 1607 on September 29 failed to install and would roll back for many users. The company claimed that a small number of customers in the Windows Insider Program that were running a previous build of the OS were affected.
"We became aware of an issue with the recent Windows 10 cumulative update that impacted a small number of customers in the Windows Insider Program that were running a previous build of the OS. We have created a solution to resolve this issue, which is now live and can be accessed here."
Users affected by the update reported that after the system reached the 100 percent mark, they would get a prompt saying the process could not be completed and thereby reverting the changes, resulting in a loop of failed attempts.
Microsoft has released a patch that fixes the issue. That link takes you to the Windows 10 1607 (RS1) Script fix to unblock update for Insider.
There is no clear indication as to how many users have been affected although Microsoft says it's a "small number". However, ZDNet's Ed Bott claims "the number is probably in the hundreds of thousands, representing systems that were in the Windows Insider Program, receiving preview releases, during the first half of 2016 before switching to the public branch."