Best Answer
Just an update. I resolved the problem by doing the following:
-- In Services, disabled Windows Update
-- Configured File Explorer to display system files
-- Deleted all files and folders under C:\Windows\SoftwareDistribution
-- In Services, enabled Windows Update
-- Restarted Windows, ran Check for Updates
At this point it did a clean download and install of the large cumulative update.
Last edited: Feb 16, 2017