Sorry for the bad news, but this is one of several recent Windows Updates that have been failing for folks. This updates your Win10 build to 685. The other failing updates were for 631 and 661 -- and in both cases, what worked was a much later update that fixed the issue.
Since MS only guarantees patches the second Tuesday of the month, it is likely now going to be January before they come out with another update that will fix this issue.
I was stuck on the 661 issue and the only way I could fix it was: (1) restoring the PC to build 630 using an image backup I had made using Macrium Reflect, (2) using UUPDUMP to download and create an ISO of the 685 build, (3) doing a Repair-Install using that ISO.
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