If you are having trouble updating the Word Add-in on a Mac computer, reinstalling the app should help.
To reinstall the app:
1. Click on the "Insert" tab, then go to "My Add-ins".
2. Remove the Precedent Add-In.
3. Install the Precedent Add-In again. Click on the "Insert" tab, then go to "Get Add-ins".
4. Search for and add Precedent.
This will install the latest version of Precedent for you.