Go to office.com setup for Office Setup. · Sign In or Create a new Microsoft Account. · Find your Office Product Key. · Enter Microsoft Office Product key. ·However, if this is the first time you're installing Office, you may have some pre-installation steps to do first. Expand the Learn more section below for more ...Step 1: Go to www office com setup or www.office.com setup. Step 2: Sign in with your Microsoft account, or create one if you don't have one. Be sure to ...Office365 com/setup - To start your Office 365 download and install office setup by visiting www.office.com/setup. Then enter product key for activation.