If Windows 7 came pre-installed on your computer or you bought a physical copy, the key is likely already in your possession:
As of January 2020, Microsoft has ended support for Windows 7. Continuing to use it without security updates poses significant risks. This information is provided for legacy or offline systems only. product key windows home premium 7
On January 14, 2020, Microsoft officially ended extended support for Windows 7. This event fundamentally changed the value and utility of Home Premium product keys. If Windows 7 came pre-installed on your computer
If Windows is currently installed and activated but you can't find the sticker, you can use software to "pull" the key from the registry: product key windows home premium 7