Several factors matter when you choose the Microsoft 365 subscription. Depending on your requirements on the respective productivity platforms, these products are different in price. microsoft365.com/setup
Go to Microsoft365.com/setup, Microsoft 365 Setup website.
Sign In to your Office Account or Create a New One.
Now Enter Product Key.
Click Install Office Button.
Go ahead and Click Install Office Again.
Save and Run office setup.
Wait for Office to finish Installation.