I have noticed this occurring for a lot of user's who were offered the Windows 10 upgrade, but Windows won't install. Now it could be a hardware or software issue. So before you try this tweak check your computer manufacture for recent software updates before you begin and hopefully this will resolve your installation problems. Thanks from the help of Techradar.
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- Open Windows Update by positioning the mouse pointer in the bottom right corner of the screen and then moving it up. After this click Settings > Change PC settings > Update and recovery.
- Next, click on "choose how updates get installed" and on the next page choose the relevant option under Important updates.
- From there choose "give me recommended updates the same way I receive important updates" check box from under the Recommended updates section
- Under Microsoft Update then choose the "give me updates for other Microsoft products when I update Windows" check box and click "Apply."
- Open up Windows Explorer to view the files on your PC. Go to C:\Windows\SoftwareDistribution\Download and delete all the files that are in the folder (but don't delete the folder itself).