Believe it or not, Windows 7 Professional product keys are still sold by third-party resellers (often for $20–$50). However, be cautious: many keys are for Volume Licensing or are already used.
Version 2.2.5 is a specific legacy iteration of this tool that circulated heavily on third-party file-sharing networks, torrent sites, and direct-download blogs. How Does RemoveWAT Work? FULL RemoveWAT 2.2.5 Windows 7