Oh, ok....
make sure you download the map for the regions you want from here
global topo data these will be .tar files.
you have to unzip them....then you have to unzip them AGAIN! LOL that one had me confused for quite some time.
after that you will be able to get to the .DEM file for the map. put it in the mapmaker folder and you are all set.
oh, and yes, put everything you use in themapmaker folder
the gusgs1_2.img
the mapmake app and the dem files