This is an outright purchase of Office 2021 so you don’t have to worry about renewals.

Installation

1. Go to office.com/setup and sign in with your Microsoft account. (If you don’t have an account, then create a new Account)
2. Enter the product key received in your email.
3. Click “Next” and then click “Confirm”.
4. Click “Install” corresponding to the product on your Account Services and Subscriptions page.
5.  Follow the prompts until installation is finished.
6. Launch any Office app from your app list or by typing in the search bar and start working.