The Message Word not found or Excel not found is sometimes displayed when exporting to Word or Excel from TaxCalc when using Office 2016 on a Mac
Microsoft Office needs to be updated to version 15.18 or newer before it will work as expected with TaxCalc
Open any of the office components, go to Help > Check for updates and select the Check for Updates box.
In the same box, you will see the option to turn on Automatic updates. It is recommended that this option is selected.