Can't install Cumulative Update for Windows 10 for x64-based Systems (KB3093266)

Every time I restart it fails to install. I tried changing the registry keys under profile list to my C: drive instead of %systemdrive% as mentioned here.

Windows 10 Cumulative Updates Failing (On Computer with SSD System Drive + HDD)

I still get the same problem. I would try a few more things but there is no error code it literally just states that it failed..

Answer

According to the log, Windows can't create a hardlink of the file PresentationCore.dll because the destination is not on C:, it is on drive D: (D:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0\PresentationCore.dll)

2015-10-10 17:14:15, Error CSI 00000008 (F) Error:
ResolvePendingTransactions called after poqexec failure (call 1)
Status = STATUS_NOT_SAME_DEVICE, Operation = HardLinkFile, DiagString
= [l:414{207}]"\SystemRoot\WinSxS\amd64_presentationcore_31bf3856ad364e35_10.0.10240.16425_none_b4330ece2aa010d8\PresentationCore.dll,
\??\D:\Program Files\Reference
Assemblies\Microsoft\Framework\v3.0\PresentationCore.dll"

and this causes a STATUS_NOT_SAME_DEVICE error and Windows stops installing the update.

So you moved the Program Files folder from C: to D: and this is not supported.