Ok, I finally figured out my problem. For some reason when I download the .loc files with Mozilla, MacGPS Pro does not recognize the file (even if it is named as a .loc file).
I am not sure why this is. But I just tried downloading the same thing with Internet Explorer, and it worked fine! I really don't understand what the difference is (I'm also new to Mac's and GPS at the same time). So please forgive my ignorance on why which browser is making a difference.
But as a heads up for other MacGPS Pro users, Mozilla will not work for downloading XML .loc files!
Matthew
http://www.defenseengineering.org/rowe/