Windows 10 Downgrade Options

For one year, Microsoft is allowing consumers and some businesses with systems running Genuine Windows 7 and Windows 8.1 a free upgrade to Windows 10. But when we asked: Once you upgrade for free to Windows 10, is it possible to downgrade back to Windows 8 or 7 without having to buy a new OS license? Microsoft said those who upgrade to Windows 10 for free will have one month to revert back to the old OS on their device.