Since Windows 7 is "End of Life," you are essentially buying a "New Old Stock" license or a surplus retail key.
: Scroll to the bottom. It should display the "Microsoft Genuine Software" logo and state "Windows is activated". where to buy windows 7 digital download
: Type slmgr.vbs /dli in the search bar. A popup will show if the license is "Retail" or "OEM." Since Windows 7 is "End of Life," you
Buying legacy software requires extra caution to ensure you don't end up with a "grey market" key that fails. where to buy windows 7 digital download
: Offers lifetime retail licenses. These are transferable to other devices (one at a time), which is a safer bet than non-transferable OEM keys.