To activate Microsoft Office, go to office.com/setup, sign in with your Microsoft account, and enter your 25-character product key. Once verified, you can download, install, and start using your Office apps.
 
Key Highlight Steps: Enter your Office product key from office.com/setup
 
  1. Go to office.com/setup.
  2. Sign in or create a Microsoft account.
  3. Enter your 25-character product key.
  4. Select your language and region.
  5. Confirm and click Next.
  6. Download and install Office.
  7. Launch any Office app to complete activation.