Printed Documentation needs Microsoft Word

I've successfully used the Printed Documentation before (although that was with RH 11; I'm using RH2015 now), but today when I try to use it, I get this:

of course MS Word has been started on my computer; I've used it dozens of times this week alone. Also, where do I click "Start using Microsoft Word" ... and why, since I'm trying to create a PDF file?

thanx,

Lon