First, open the MS Office Setup website www.Office.com/setup or Office.com/setup into your browser and sign in with your Microsoft Account. If you don't have an account then, in that case, create a new account and sign in with that.
After doing sign in you need to Enter your Product Key, Country or region, and Your Language to get your Microsoft Office Setup. Here's what to do next:-
Click the Download now button.
Save the file to your desktop. Don't change the file name.
Double click on the file icon.
Enter your Product Key.
Follow the on-screen instructions to activate your license.