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Windows 10: Why is KB4015438 offered by windows update and fail to install? 
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1607 update fail - You can't install windows on a USB flash drive .... in Windows Updates and Activation
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KB4015438 and KB4013429 fail to install in Windows Updates and Activation
I have not been able to install these updates. Searches suggest going to the Microsoft updates acalogue to download stand alone updates but if you can see my attachment all I get at that website is a plain blue screen.
Cumulative Update KB4015438 for Windows 10 v1607 Build 14393.969 in Windows 10 News
UPDATE: This cumulative update KB4015438 has been replaced by KB4016635 on March 22nd 2017.
Source: March 20, 2017—KB4015438 (OS Build 14393.969) - Microsoft Support
To manually download:
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Windows Updates fail to install an already installed update error??? in Windows Updates and Activation