Whether you have purchased the Office setup online or offline, you will get a product key. In case of offline purchase, the key is available on the back of Office retail card. On the other hand, if you have purchased it online, you will get the Office product key on your registered email Id. Keep this key secure with you as it will be asked during the time of Office activation.
To download office setup, visit office.com/myaccount Login to your Microsoft account by providing the registered email ID and password
New users can go for sign up process
Enter the 25-digit key
From your Office account, download the Office subscription you want