To download and install Office 365, go to office.com/setup, sign in with the account you used to purchase it, and click Install Office. Follow the on-screen instructions to complete setup and start using your Office apps.
 
How to download and install Office 365?
 
  1. Go to office.com/setup.
  2. Sign in with your Microsoft account.
  3. Click Install Office on the homepage or from your dashboard.
  4. Download the installer for your device.
  5. Open the setup file.
  6. Follow the on-screen prompts.
  7. Wait for installation to complete.
  8. Launch any Office app.
  9. Sign in again if prompted.
  10. Office 365 is now ready to use!.