Accept the Office Insider Program terms.Select the Join The Office Insider Program To Get Early Access To New Releases checkbox within Microsoft's AutoUpdate window ( Figure C).Open Microsoft AutoUpdate by opening a Mac Office 2016 32-bit application, clicking Help, and selecting Check For Updates.To sign up for the Office Insider Program, follow these steps.
Mac users can access the early version of 64-bit Office applications (Word, Excel, PowerPoint, OneNote, and Outlook for Mac) by joining Microsoft's Office Insider Program.
