I don't think you can use that now since you had a previous OS before. You will have to use the link Stranglehold linked you to.
I'm not sure if the recovery disk program in the control panel will work for you now since you upgraded from windows 7. Download the iso file from the link Stranglehold gave you and will have a windows 10 install dvd to install fresh later on when needed.
I have downloaded the Windows 10 ISO file. But it seems that I'd need a window key to install, according to the writing on MS website.
That would be good to know.You can skip during installation, when you sign in with the same MS account then it will activate Windows.