Wait, he's saying he has Windows 10 on his HD, but only has a DVD and key for Windows 7 - but wants Windows 10 on his SSD.
I don't think that's been addressed?
In that case, isn't cloning his only option - if he makes a Windows 10 install file, he won't have a Windows 10 key for it. The days of the free Windows 7 to 10 upgrade are gone.
I'm assuming he upgraded his HD from Windows 7 to 10.