As long as you have an active email address with us, you can install and use Office on your home computer.
In your browser, go to http://outlook.office365.com and log in with your school email and password
Once you're logged in, click on "Office 365" at the top of the page
Now click on "Install Office" and choose "Office 365 apps" from the dropdown menu
The installer will download. Just follow the prompts until you have it installed.