[Edratman]

This is a guess, but this is a mistake I made.,

When you unzip a map or mod file it sometimes(?) puts both files map and Tga in the case of maps or the dm file is in the folder with the tga files. The game doesn't see the map file or the dm file if it is the file. Also sometimes the folders are within another folder, which prevents the game from seing them.

So after downloading the map files, they must be appear in identical fashion in the maps subdirectory as the maps that came with the game.