I can't fathom why you and many others appear to be having problems with the 'wushowhide' file from Microsoft.
Once you hide this KB4056892 cumulative update, it is permanently blocked until such time you decide to release it back onto your system to be downloaded again. I would recommend that you run the 'wushowhide' one more time and check to see if this has fixed the blocking process.
If not, go to your app folder and use the 'Get Help' app to talk to a live Microsoft technical support staff member. They will be able to assist you further with this gremlin.