This is the only official way to ensure your OS is genuine and receives all security updates. Where to find it:

: For a more detailed check, open the Command Prompt as an administrator and type slmgr /xpr to see if the machine is permanently activated. YouTube·Brandon Maxwellhttps://www.youtube.com How To Activate Windows 8.1 Pro. (Build 9600)

Remember: Unactivated Windows 8.1 Pro will still work indefinitely. You lose personalization and see a watermark, but you won’t suffer ransomware. Sometimes, the watermark is the safer choice.

This is where the search for an activador begins.