Go to Office.com, sign in with a free Microsoft account, and select Word.
If you absolutely need the offline desktop version, consider: download microsoft word free for windows 10 updated
If you specifically need the full desktop features for a one-time project, you can download the Microsoft 365 trial. Go to Office
Do you need to use Word or is an internet connection always available? Are you currently a student or using this for a business ? Go to Office.com