Windows 10 update download successfully completed but installation failed, how can I get it to finish?

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Windows Central Question

windows 10 update download successfully completed but installation failed

Errors received while installation :-

Upgrade to Windows 10 Home Single Language
Installation date: ‎10/‎7/‎2015 12:37 AM
Installation status: Failed
Error details: Code 80240054
Update type: Optional
Install the next version of Windows.
===============================
No help found explaining this error code , also it asks me to again re download the whole update of windows 10 that is around 4GB of data.

Can anybody please help and let me know about the error message.
And anyway with which i can use the downloaded files on my system , if still existing after rollback
 

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