If you want or need to download Office in full to install, instead of using the streaming install, you can download an installation file. The downloaded file contains both the 32- and 64-bit installations.
Office 365 Business, Enterprise, and Educational Subscriptions
If you have an Office 365 Business or Enterprise subscription, you (or your administrator) will need to use the Office Deployment Tool to download and install Office 365 offline. For instructions, see Use the Office offline installer
Office 365 Home and Personal Subscriptions
If you have an Office 365 Home or Personal subscription, log into the Services & subscriptions page. Click Install, then Other Options. Tick the box to Download an offline installer. For instructions, see Use the Office home offline installer