What to try if you can't install Office 2016 for Mac

Choose your installation issue:

Have you seen this error?

"Microsoft Office 2016 can't be opened because it is from an unidentified developer."

This error occurs in MacOS 10.11. To fix this issue:

  • Click OK and wait 10 seconds. Try opening the file again.

  • The issue has been fixed by Apple in MacOS Sierra (10.12). We recommend you upgrade your OS to the latest version and then try again.

  • The download is corrupted. Drag the Microsoft_Office_2016_Installer.pkg to Trash to delete it.

  • Start the download again by clicking here.

  • If the new download is still not working, delete the installer.pkg file again and try the download from this link instead.

The error that says the Microsoft_Office_2016_Installer.pkg can't be opened because it is from an unidentified developer, has been fixed in an update by Apple.

  • Click OK. Wait 10 seconds and try again.

  • Update to macOS Sierra (10.12).

  • Restart your computer and install Office 2016 again.

  • Wait for the download to be complete. It may take a while, and may start and stop. The final file size should be around 1.5 gb.

  • Move the Microsoft_Office_2016_Installer.pkg from the Downloads folder to the desktop, and then double-click to launch.

  • If it's still not working, delete the installer.pkg file and redownload by clicking here.

  • If the new download is still not working, delete the file again and try the download from this link instead.

Check that your Mac meets or exceeds the minimum system requirements. For the most up-to-date system requirements information for Office 2016 for Mac, see System requirements for Office.

Still having trouble? We're listening.

This article was is updated based on your feedback. If you still need help installing or activating Office 2016 for Mac, tell us about your issue in detail by leaving us a comment below and we'll try to address it in the future.

You can also contact Microsoft support to talk to a human.

See Also

Activate Office 2016 for Mac

Office 2016 for Mac uninstall instructions

Where to sign in to Office 365

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