Apple began transitioning to 64-bit hardware and software technology for Mac over a decade ago, and all modern Macs now include powerful 64-bit processors that can run advanced 64-bit apps. 32-bit app compatibility with macOS High Sierra 10.13.4 and later About the transition to 64-bit technology and how it affects 32-bit apps. But you can also manually download the updates: Open the Mac App Store from your Dock or Finder.
If you downloaded Office from the Mac App Store, and have automatic updates turned on, your apps will update automatically.
