KB4012218 and KB4012219 are patches with CPU detection If you recently bought a new PC or assembled one yourself with a new CPU and decided to install Windows 7 or Windows 8.1 on it, you will not be able to update these operating systems. Microsoft is not going to deliver updates for you any more. This was recently announced. A newly released set of patches brings the CPU detection feature to Windows 7 and Windows 8.1.
Both updates will prevent your operating system from downloading and installing updates if you have one of the following CPUs:
Intel seventh (7th)-generation processors (Kaby Lake) or later
AMD "Bristol Ridge" (Seventh generation) or newer
You may see some comments here: http://www.msfn.org/...-cpu-detection/
I have read that if you uninstall this patches you have full acess to WU again, but then after the next month update this blocking is going to be installed again.