Before you can download and install the Office apps, you will need to have a license added to your account by IT. You can request a license from the help desk.
Navigate in a web browser to https://portal.office.com.
At the top right corner of the page should be a button to "Install Office".
Click on the button. If the option "Office 365 Apps" is not available, the license is not applied to your account. Send a request to [email protected] to have it added to your account.
Clicking on "Office 365 Apps" will download the installer. Run the installer once downloaded and follow the prompts to install office on your computer.