I'd leave it out and point the way. Including it with your runtime suggests that you are taking responsibility for it which is likely not in your game plan.
A simple "if you desire to print to pdf in place of hardcopy, a pdf converter is required. One such converter which is available at the time of this release may be found at ___________ though other pdf converters may be used"
This clearly shows that you are not endorsing a given product. All the same, is there a bonus revenue stream for you if you package in a specific converter due to the additional exposure your product would give?
Just thinkin' out loud.
Thank you, Ninja. Your perspective is re-assuring. That does seem to make the most sense.
Regarding a possible revenue stream, I had thought about that. The publisher does have several other products that are not free, so there could be some interest. But it probably is not a priority for us right now. Besides, bundling it also could give the impression that it is the one that must be used with our product. Since many people already may have and use a different converter, I think we will just let it go at that and offer the suggestion, like you said.