Seems no fix yet from MS as Cumulative Update for Windows 10 Version 1511 for x64-based Systems (KB3147458) here is hanging at 90%
My opinion of W10 is it seems this OS is very unpredictable and certainly not smooth by any stretch of the imagination.
IMO, XP is still the smoothest OS ever put out by MS!!
EDIT: After over an hour the updates finally progressed past 90% and eventually installed.
Very Glitchy!!