Download Grammarly for Microsoft® Office and installing it.

Grammarly is a great choise if you are gonna deal with Microsoft office(Word , Outlook )

As the company says :"Get Grammarly’s suggestions right in your Word documents and Outlook emails."
 You can use this link
Which is gonna give you a direct download .
The app is about 10.3 MB.

This is the app.

Double click to open it .
  Click on "Run"

Choose what you want (Word or Outlook or both of them )
I'm gonna keep both of them.

Wait for it .

Done !!

[We will see together in other posts how to use it] .