Hi John,
What’s the Office 365 you have purchased? If you have purchased Office 365 Small Business Premium, Office 365 Enterprise or Office 365 Home Premium, you can install Office application on 5 PCs and Macs with your Office 365 account.
If you are using one of the subscriptions I have mentioned, please go to the download software page. The page will display the right version of Office application for you according to your Operating system. Please reply to me with the subscription you have purchased if it hasn’t been mentioned by me.
You may check the 5 installs per user on PC or Mac value in the following article for Office 365 for Business.
Office Applications Service Description
Thanks,
August