This method resets the 30-day evaluation period, allowing you to use Windows 7 without a product key for a limited time. Open Command Prompt as an Administrator . Type slmgr -rearm and press Enter . Restart your computer to apply the changes.

slmgr /skms : Sets a Key Management Service (KMS) server for volume activation. slmgr /ato : Triggers the online activation process. Using .txt or .cmd Scripts

If you have a valid Volume License or retail key , you can install it manually through CMD: slmgr /ipk : Installs the product key.