A friend of mine just bought a laptop from someone used. It came with Windows 7 Home with the pre-activated OEM without license key. I am guessing the key is stored in BIOS. The friend wants to upgrade to Windows 10 Pro. I thought about doing a wipe and install from the Windows 10 license I have via a Dreamspark account. I have read that if the key is in BIOS it will be a royal PITA to get it to go to Windows 10 Pro; that it likely will Install Windows 10 Home. Is this correct? If so, what is the most efficient way to get this to Windows 10 Pro?