This worked for me...
- Access this file location C:\Windows\SoftwareDistribution\Downloadand delete everything there. (Note delete only content found there and not the Download folder itself)
- Open CMD (command prompt) with run as administrator (admin privileges) and run this command: wuauclt.exe /updatenow
The Update Window should pop-up with downloading Windows 10 again, and if your lucky it will be the complete kit this time.
Source: http://sccmtips.ro/fix-windowsupdate\_80240020-error-in-windows-10-downloadinstall/
Hello!!
This hint worked very well for me when upgrading from Windows 7 Profesional 64bits to Windows 10 Pro.
Thanks for posting.
G.González