Hi,
Did you install other version of Office in Mac before?Did you get any error messages?
It is recommended that you try to uninstall Office for Mac completely in mac then re-install Office in Mac to help you troubleshoot the problem:
https://support.microsoft.com/en-us/office/troubleshoot-office-for-mac-issues-by-completely-uninstalling-before-you-reinstall-ec3aa66e-6a76-451f-9d35-cba2e14e94c0
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