you should have a electronic activated licence which is linked to your motherboard and it did affect my licence.
down load the creation tool for windows 10 from Microsoft and run it then you upgrade this pc now and keep your apps and file
once this is complete your should be able to update windows again
There are a lot of videos on you tube to watch just put in "in place upgrade for windows 10" it was very easy and didn't loss a thing
hope this helps