To install Office with product key, go to the office.com/setup website and enter your  office 25-digit product key. Then follow the prompts to download and activate your Office setup.
 
How to Install office with product key?
  1. Go to Install office with product key at office.com/setup.
  2. Sign in with your Microsoft account or create one.
  3. Enter your 25-character product key and click Next.
  4. Select your country and language, then click Next.
  5. Click Install to download Office.
  6. Open the downloaded file and follow the on-screen instructions to install.
  7. Once installed, open any Office app and sign in to activate.
Additional Notes
  • If you encounter activation issues or need to reinstall Office later, you can always manage your subscription and reinstall Office from your Microsoft account without needing the product key again.
  • For older versions of Office or volume licenses (e.g., MAK/KMS keys), manual activation methods may apply.
Following these steps will ensure that your Microsoft Office is installed and activated successfully!