Please open Word for Mac then click Help > Check for updates to launch MAU, right-click the icon on the Dock > Options > Open in Finder, then delete the file.
After that, go to /Library/Application Support/Microsoft, delete the folder Microsoft AutoUpdate.
At last, you could download and install the latest version from this page: https://learn.microsoft.com/en-us/officeupdates/update-history-office-for-mac
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