Follow these instructions for Windows and Mac OSX installations only.
For information on configuring mobile devices:
If you already have Microsoft Office installed on your Windows Computer it is recommended that you firstly uninstall from Add/Remove Programs, then reboot your computer.
To Unsinstall Office for Mac OSX, please follow the instructions found here
To install the latest version of Office
1. Sign in to Office 365 by using your user ID.
2. At the top right of the page, click Settings > Office 365 Settings.
3. Click Software
4. On the Office page, select a Language, and then click Install.
* Note for Windows users: the 32-bit installer can be installed on both 32-bit and 64-bit versions of Windows. If you have 64-bit Windows then you may prefer to download the 64-bit version, you can do this by clicking Advanced then changing the dropdown list to 64-bit, before clicking Install.
To find out if you have a 32-bit or 64-bit version of Windows:
On Windows 7: click the Start button, right-click Computer then click Properties, then under System Type you should see either 32-bit or 64-bit operating system
On Windows 8.0: on your keyboard press Windows Key and D together (to put into desktop mode), then hover the mouse in very bottom right corner, and from the popup menu click Settings, then PC Info.
On Windows 8.1: right-click the Startbutton then click System.