Go to portal.office365.com in your preferred web browser
Sign with your work email account
Click the Install Office Button and then select Office 365 Apps
Your browser will download the installer file. Once complete, click the file and it should open.
Office will then install along with all its appropriate applications; Word, Excel, Outlook, PowerPoint etc.
Allow the installation to complete. Once it has finished, you can access the applications by searching for them in the Start Menu.