If you are an old user of Office 365 suite and already have an Office setup product installed on your device, the go to office.com/setup and sign in your account and update your subscription. If you’re a first time user, and don’t have a Microsoft account, then create one and follow the given instructions
Go to the Office.com/setup and sign in your MS Office account Enter the product key in the given field Download the purchased Office 365 suite Install the program by following onscreen instructions.