Buy Windows 7 License: How To

: Many sellers on sites like Back Market or Newegg sell older "Grade A" refurbished PCs that come with a Windows 7 Pro license pre-installed and activated. 3. Use a Windows 10/11 Key (Downgrade Rights)

This allows you to legally use Windows 7 Pro instead of the newer version. how to buy windows 7 license

Since Microsoft no longer sells Windows 7, you must rely on the secondary market. : Many sellers on sites like Back Market