Retail boxed and OEM versions are frequently available on eBay .
: Because it is no longer supported, using Windows 7 on a device connected to the internet is considered a significant security risk. buy windows 7 professional from microsoft
If you purchase a new PC with or Windows 10 Pro , you may have "downgrade rights" that allow you to use a Windows 7 Pro license legally, provided you have your own installation media. Important Considerations License Types : Retail boxed and OEM versions are frequently available