I know the maps are free but the program to get the files to halo CE isn't I'm talking about the program that extracts the files to the game.
Once more: Halo CE IS FREE
for any owner of Halo Combat Evolved, and ALL Halo CE MAPS ARE FREE.
I guess your talking about the fact that most of the downloaded files are in "ZIP" format?
Unless you're running a very OLD version of WinDoze, you should simply be able to DOUBLE-CLICK on the zip file and it should then display all the files (that are in the ZIP archive.) All you need to do from there is to drag the ".map" file (for each map) into your Halo CE "MAPS" directory.
NOTE: The more maps you have in that directory, the longer it takes to load and start up Halo CE.... (There is a "workaround" that lessens the delay, however, but don't deal with that until you've got your Halo CE all running fine....)