After you bind the Microsoft Office product key to your Microsoft account, license of Office will go with your Microsoft account.
Step 1: You go https://setup.office.com/ to bind the Microsoft Office product key to your Microsoft account. If you haven’t Microsoft account, you create an account.
Step 2: You download Microsoft Office here: https://account.microsoft.com/services/
Step 3: You login the Microsoft account to Office. Then you activate it
