Currently I've had several failures when trying to upgrade to windows 10, gives me an error called 80004005 when I check the logs to see what went wrong. So I've tracked down I need to use the command prompt to mess with windows update, currently I'm stuck on step 3 of this guide https://support.microsoft.com/en-us/kb/971058 . I'm trying it manually as the automatic fix didn't work.
Delete the qmgr*.dat files. To do this, at a command prompt, type the following command, and then press Enter:
Del "%ALLUSERSPROFILE%\Application Data\Microsoft\Network\Downloader\qmgr*.dat"
All it does is feed me a "The system cannot find the path specified".
Higher resolution screenshot here