1. Open a browser of your preference and go to https://diagnostics.office.com/

2. Click on Download now and then click on Run

3. Wait until the application is launched

4. Select Office Setup and click Next

5. Select the last option and click Next

6. Select Yes as this app is running on the affected machine and click Next

7. Provide your credentials and click Next

8. Let the app do the rest

9. Validate if your Office products are licensed