Install and activate office 2016 professional plus with product key
1. You need to have a Microsoft account. If you don't have one, you can use any email to register one, but it is recommended that you record this account and you will use it frequently.
2. Search page http://setup.office.com.
3. Log in to Microsoft account.
4. Enter product key.
5. Select language and region.
6. Office 2016 professional plus page appears, click Activate.
7. Wait a few minutes, reopen the office and use it normally.