I was heard that free upgrade program from microsoft was expired. So if you are still remaining using Windows 7/8.1, you will lost the chance to get genuine Windows 10 license. Since the moment you upgraded to Windows 10, your motherboard already registered to Microsoft as a permanently genuine copy of Windows 10 user. No matter how many times you reformat your Windows 10, or install it into a new SSD/HDD, your Windows 10 will still automatic activated as genuine.