<div>
MS official document lists this update as a prerequisite:<br />
<a href="https://support.microsoft.com/en-us/kb/2919355" rel="ugc">https://support.microsoft.com/en-us/kb/2919355</a><br />
Can you check if you met this requirement?<br />
If already installed, please post back the installation log files of the update that failes (they're usually one of the newer files in the C:\Windows folder)
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MS official document lists this update as a prerequisite:
https://support.microsoft.com/en-us/kb/2919355 [https://support.microsoft.com/en-us/kb/2919355]
Can you check if you met this requirement?
If already installed, please post back the installation log files of the update that failes (they're usually one of the newer files in the C:\Windows folder)

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Please let us know about KB2919355. That update is from a year ago. Have you got all other critical AND recommended updates installed? There were TWO patch Tuesdays just this month alone, so there are dozens and dozens of recent updates. KB3020370 is a year newer and is on my Windows 8 machine. <br />
<br />
The update is for 64-bit systems and there appears to be a conflict with language packs.<br />
<br />
<a href="https://support.microsoft.com/en-us/kb/3020370" rel="ugc">https://support.microsoft.com/en-us/kb/3020370</a>
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Please let us know about KB2919355. That update is from a year ago. Have you got all other critical AND recommended updates installed? There were TWO patch Tuesdays just this month alone, so there are dozens and dozens of recent updates. KB3020370 is a year newer and is on my Windows 8 machine.

The update is for 64-bit systems and there appears to be a conflict with language packs.

https://support.microsoft.com/en-us/kb/3020370 [https://support.microsoft.com/en-us/kb/3020370]

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both systems are up to date. &nbsp;At least according to windows update. &nbsp; windows update is set to automatic. &nbsp;this is the only update that shows as not being installed and it shows as optional.
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both systems are up to date.  At least according to windows update.   windows update is set to automatic.  this is the only update that shows as not being installed and it shows as optional.

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Ran the following on both machines and the problem was fixed:<br />
<br />
In an elevated command prompt: &nbsp;DISM.exe /Online /Cleanup-image /Restorehealth<br />
<br />
Per KB947821
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Ran the following on both machines and the problem was fixed:

In an elevated command prompt:  DISM.exe /Online /Cleanup-image /Restorehealth

Per KB947821

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So that is the answer I gave you above and you should probably close the question
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So that is the answer I gave you above and you should probably close the question

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Can you upload:<br />
<br />
%SYSTEMROOT%\Logs\CBS\CBS.<wbr />log<br />
%SYSTEMROOT%\Logs\CBS\Chec<wbr />kSUR.log<br />
%SYSTEMROOT%\Logs\CBS\Chec<wbr />kSUR.persi<wbr />st.log<br />
%systemroot%\windowsupdate<wbr />.log<br />
<br />
for us?
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Can you upload:

%SYSTEMROOT%\Logs\CBS\CBS.log
%SYSTEMROOT%\Logs\CBS\CheckSUR.log
%SYSTEMROOT%\Logs\CBS\CheckSUR.persist.log
%systemroot%\windowsupdate.log

for us?

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@gmerilli &nbsp;- Thanks for following up.
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I have KB3020370 as an optional update on two of my windows 8.1 systems. &nbsp;It fails to install on both systems. &nbsp;I have tried to do a standalone install but that fails also. &nbsp;does anyone have this problem also.
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I have KB3020370 as an optional update on two of my windows 8.1 systems.  It fails to install on both systems.  I have tried to do a standalone install but that fails also.  does anyone have this problem also.

KB3020370 fails to install on two different windows 8.1 systems

Windows 8 is a personal computer operating system developed by Microsoft as part of the Windows NT family of operating systems, with an emphasis on improving its user experience on tablets. In particular, these changes included a touch-optimized Windows shell based on Microsoft's "Metro" design language, the Start screen, a new platform for developing apps with an emphasis on touchscreen input, integration with online services, support for USB 3.0, Advanced Format hard drives, near field communications, and cloud computing. Additional security features were introduced, such as built-in antivirus software, integration with Microsoft SmartScreen phishing filtering service and support for UEFI Secure Boot on supported devices with UEFI firmware.