Microsoft Word, Excel and PowerPoint don’t allow editing on a Mac
This article provides instructions on how to fix the editing error message "doesn't allow editing on a Mac"
Some Mac users may need to completely remove the application and supporting files before reinstalling from our website.
One of the common error messages is "doesn’t allow editing on a Mac" if they have previously had a different version of Microsoft Office installed on the computer.
Follow the below instructions from the Microsoft Website to uninstall/reinstall Office for Mac