I had this pop up appearing, and eventually pressed okay Tuesday 19th Aug.
3-4 minutes later, 'update has installed' message.
Later that evening, I had a warning from my full McAfee security, that,- 'WARNING. ANOTHER COMPUTER HAS JUST CONNECTED TO THIS COMPUTER.'
At which point , straight to shut down, and then unplugged everything.
In the years I have been using McAfee I have NEVER had that warning message, which I presume meant I was being hacked.
Very suspicious that both events took place on the same day.
I have done a full scan with McAfee and Microsoft Security Scanner, and both scans show 0 infection.
I have changed passwords on my router.
I have done a system restore back to 6 days previous to this.
Still quite worried about my system.