Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Try this in order:
- Open any Office app such as Word or Excel.
- Select Help > Check for Updates.
- In Microsoft AutoUpdate, make sure automatic updates are enabled, then select Check for Updates again.
- If Microsoft AutoUpdate shows an error or does not run correctly, install the latest version of Microsoft AutoUpdate and run the installer package.
- After reinstalling Microsoft AutoUpdate, open it again and update Office.
If the Mac is managed by an organization and software installation is blocked, contact the Helpdesk or IT administrator.
If the update problem started after installing Office Home & Student 2016 from account.microsoft.com, install version 15.41 first and then use Microsoft AutoUpdate to move to the latest available version.
References:
- Troubleshoot Microsoft AutoUpdate in Microsoft 365 and Office for Mac | Microsoft Support
- There is a serious disk error on when attempting to save, copy and paste or create auto recovery files in Office for Mac
- Latest version of Office for Mac Home & Student 2016 not available from account.microsoft.com | Microsoft Support