New
#1
Try downloading and using the Windows Update MiniTool (WUMT): it makes an excellent Windows Update (WU) alternative/replacement. It will often work when regular WU fails or won't download updates. On the other hand, it sometimes fails to work as well. Based on long observation of similar complaints here at TenForums over the past 6-8 months, I've come to reluctant conclusion that severe difficulties fixing update problems is a valid ground for a Windows 10 upgrade/repair install (as described in this excellent TenForums tutorial: Repair Install Windows 10 with an In-place Upgrade).
HTH,
--Ed--
Download WF.bat and run it as admin, it might take about an hour to finish, then select everything to clean.