Office Setup – Microsoft Office is a collection of desktop productivity applications designed for business and home purposes. Go to office.com/setup for Office Setup. Sign In or Create a new Microsoft Account. Find your Office Product Key. Enter Microsoft Office Product key. Select your Country and Language. Download Office Setup and follow On-Screen instructions. First, confirm that your computer or mobile device meets the system requirements for running Microsoft 365. If your computer or device meets the requirements, you can get started here. Follow the instructions for signing in or creating a new account.