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Issues w/ Cumulative Update for Windows 10 Version 1511 (KB3163018)
I have a Windows 10 system upgraded from Win7. Windows Update failed on this recent cumulative update. The web has lots of hits about this. After trying a number of fixes, the following worked for me:
1. I went into Disk Management and saw that my System Reserved Partition was 100MB vs the minimum recommended (according to some sites) of 400MB.
2. I used MiniTool Partition Wizard (free edition) to resize the System Reserved Partition to 450MB. That required burning a CD from a downloaded ISO.
3. Since the Windows update failed again, I deleted the contents of C:\Windows\SoftwareDistribution\Download (I did NOT delete the DOWNLOAD folder itself, just the contents)
4. BINGO! The update installed.
Hope this helps someone else who may have this problem.