Recently I had Windows Update giving me a 13EC error when installing KB2858725: The .NET Framework 4.5.1 that got release lated last November on various virtual machine systems.
It appears that a lot more people suffer from the Windows Update 13EC issue, and most of them have to to with .NET 4, .NET 4.5 and .NET 4.5.1.
Running many virtual machine systems on an SSD based host machine, so I’m always pressed with disk space (hence cleaning the various temporary files directories often). I wasn’t glad with Windows 8 update KB 2821895
Note there are some Microsoft tips to make the size of the C:\Windows\WinSxS smaller, but those still do not remove the Reserve.tmp file.
My conclusion is that various Microsoft updates now require 3 gigabytes of disk space.
This seems to be the case with the .NET Framework 4.5.1 KB 2858725 update, and probably more future updates. I tried installing the KB 2858725 update with slightly less than 3 gigabytes of space (and after the 3 gigabyte reserve.tmp appeared), and I was still getting error 13EC. But with slightly more than 3 gigabyte the update would install.
Like usual, the Windows Update help on Error 13EC is useless, see the below screenshot.
–jeroen
via: The .NET Framework 4.5.1 and its corresponding language packs are available on Windows Update.

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