My Hyper-V virtual machine running the Windows 10 Technical Preview kept displaying the error code
0xC190010C when I attempted to update to the latest build (from 9841 to 9860).
I was able to resolve this issue by clearing the Windows Update cache as described here. Briefly:
net stop wuauserv
rmdir /s %WinDir%\SoftwareDistribution
net start wuauserv
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