8.1 Pro Build 9600 Without Product Key - Activate Windows

If your computer originally came with Windows 8 or 8.1, you might not actually need to buy a new key.

slmgr /ipk <activation code>

Replace <product_key> with your actual product key if you have one. If you're trying to activate without a key, you might look into generic keys, but be aware these are typically for installation purposes and have limitations. activate windows 8.1 pro build 9600 without product key