Download and install office setup from official website after creating office my account. Enter 25 digit office product key at office.com/setup to activate office suite.
Office setup product key is a unique series of 25 alphanumeric characters. It provides authentication to your office product. It has xxxxx-xxxxx-xxxxx-xxxxx-xxxxx pattern. When you install the product key the activation will start automatically when you use your office antivirus for the very first time. But you can only activate the office activation key when you have a smooth internet connection