Websites like Eduflo or StackSocial sell legitimate, legally-purchased retail keys for older versions at deep discounts (e.g., Windows 10 Pro for $15).
(by Soraco)
There is a narrow, legal niche where keygens exist: . If software is over 15 years old, the company no longer exists, and support is gone, archivists use keygens to keep history alive. universal keygen generator license key software high quality