I have downloaded Arizona topo, Utah topo, New Mexico topo, Colorado topo, and New Hampshire topo, and MyTrails, all from this site and they all show up on MapSource, as does my Southwest 24K topo. I did find though that you need to have all of your topos un-installed from your computer before installing MapSource....then install the maps one at a time. And instead of un-installing the maps, You may actually have to make sure you delete the file folders where they are installed or the re-installation may only install what is not already there. I don't believe you have to go as far as eliminating all of the registry entries for those maps, but you may want to delete the actual "exe" map files first, then install MapSource,
THEN re-download all of the maps, install them, then start up MapSource and see if they aren't in the drop down menu. I'd even go so far as re-booting the computer before starting MapSources after its installation. I actually found that my Southwest 24K didn't show up on MapSource right away, but only after about the 3rd or 4th time that I ran MapSource, and it may have been after a computer re-boot. I can't exactly remember all the details, just that I do recall there were some weird anomolies involved.
If nothing works after that, I am clueless!
