Thanks guys, I think I got it now. I was not putting the maps in a very accessible place when I was downloading them. I got it sorted out and can now see the maps on basecamp and mapsource. Curiously enough, the CA topo does not show up on Mapsource but it is visible on basecamp. Kind of strange. I agree with what map4gps said about making sure that basecamp and mapsource are not active and closed before downloading a topo map. Thank you for your help.