Installing MS Office from office.com/setup is a matter of minutes and anyone with basic computer knowledge can perform the task. If you still need help, below we have mentioned the steps properly.

Visit office.com/setup and click on Sign In. If you don’t have a Microsoft account, you need to click on the Create option to get a Microsoft Account first. 
Once you have signed in, you need to enter the product key of your Office product or suite. Depending on whether you bought the boxed version or software version of the Office, you can find this key either in the product confirmation email or on the box.
Next, you need to select your Country and Language.
Click on the Download Office Setup option and follow the instructions on your screen.
Once the download is finished, double click on the downloaded file to install it. Follow the on-screen instructions to complete the installation.