Did you click the Help option?
Before 'ribbon technology' appeared, all applications that conformed to the Microsoft standard had a Help menu option in the menu toolbar and when that was clicked, there was an "About xxxx", where xxxx is the name of the application.
With ribbon technology, Help is often replaced by a ? but since I don't use any Microsoft products with this ribbon, I can't test it myself.
So I'm stumped. There should be an "About Word" option somewhere.