If you are on old hardware running Windows 7/8, consider Ubuntu or Linux Mint. They are free, secure, and do not require activation.
: Originally built for Windows 7, various "repackaged" versions (like 2.2.9) claim to work on Windows 8, 8.1, and 10. If you are on old hardware running Windows
Using unauthorized tools to bypass activation is considered software piracy and violates Microsoft's terms of service . Legitimate Ways to Activate Windows How to Activate Windows 10 Without a Product Key If you are on old hardware running Windows
The history of (Windows Activation Technologies) is a journey back to a specific era of the internet—the late 2000s and early 2010s—where the "cat and mouse" game between software developers and crackers was at its peak. The Origin: Breaking the "Phone Home" If you are on old hardware running Windows