Some retailers still offer digital licenses for older versions, often at lower prices. Important Considerations

Using unauthorized activation methods may violate Microsoft’s Terms of Service and compromise your digital security. Chave de ativação do Windows 7. - Microsoft Q&A

Historically, Microsoft allowed Windows 7 users to upgrade to Windows 10 for free. While the official promotional period has ended, many users found they could still activate Windows 10 using their original Windows 7 key.

If you have an original sticker (COA) on your hardware or a retail box, you can still use that 25-digit code.

A valid product key is a formatted as: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX . For the Ultimate edition, it is crucial that the key matches the specific version installed; a key for "Home" or "Professional" will not work for "Ultimate". Methods of Activation