These steps apply only to Office Professional Plus, Visio Professional, or Project Professional.

Step 1: Start an Office app, like Word, Project, or Visio, depending on your purchase.

Step 2: In the Sign in to set up Office window, select I don't want to sign in or create an account (it's a small link at the bottom of the window).

Step 3: Enter your Office product key, without hyphens. If you don't have your key, see get your.
For more info do visit:-
norton.com/setup
office.com/setup
mcafee.com/activate