As a student or staff member at Leeds, you can get up to five free downloads of Office 365 Pro Plus for PC or Mac. This page tells you how to get it.
How to get Office 365
You'll need to log in first, at http://office365.leeds.ac.uk, or via the Portal. You need to include @leeds.ac.uk after your username.
Once logged in, from the top right-hand corner of the screen, click 'Install Office'.
This page also has links for the Office Online apps, which you can use on any Internet enabled device. You don't need to install Office 365 to use these.
For more help
How can I install Office 365 Pro Plus on a Windows,
Mac, or Office mobile Apps
on an iPhone,
Phone or Android
Technical help on installing Office 365 ProPlus (aka Student Advantage)
If you need to find your original Microsoft Office product key when you've uninstalled Office 365, then you can follow these instructions.