[mag]

Originally Posted by AlbanRampon

Hello,
The description of that package is that this is a security update.
Like with any KB, you can get what it is supposed to fix from Microsoft website
KB3189866 - Cumulative update for Windows 10 Version 1607: September 13, 2016

The lagging issue is not a security problem.

AFAIK that isn't exactly correct. They highlight the security updates but those aren't the only ones included.

EDIT:
By the way, this page highlights some non-security content of these cumulative updates and the KB 3189866 contains quite a few of such fixes: https://support.microsoft.com/en-us/...update-history

If that fix isn't really supposed to be included in the KB 3189866 cumulative update, in which kind of September 2016 cumulative patch that You mentioned is..?