you might still have driver issues, but I reckon that chance very slight.
Another reason might be that you are not yet in a download wave, like I am - I don't bother that much because my internet connection is terrbile atm.
There are various solutions, the ones listed below force your pc to download and therefor install win 10.
Try this command (try an elevated cmd if this fails on a normal one):
wuauclt.exe /updatenow
You can also "hit windows update with a hammer" to make it work:
1.Uninstalled the KB2976978
(In an elevated cmd prompt)
1.net stop wuauserv
2.rd /s /q C:\Windows\SoftwareDistribution
3.net start wuauserv
another option is from microsoft: https://www.microsoft.com/en-us/software-download/windows10.
good luck!
EDIT: formatting and additional phrases.
