The downloaded maps are in your ut/cache folder. They have stupid looking names. You must rename them to their original name and file type. There is a file in that folder called cache.ini where the filename is stored. Just rename the corresponding files and then move them to their respective folders. There may be texture and sound files included with some maps, so make sure to put them in their respective folders. You may have to guess at the proper file extension, but the maps should end with .unr, and sounds with .uax , and texture files with .utx. If you don't get them properly named, pay close attention to the error message that comes up when the game crashes. It will tell you the exact name of the file it is looking for. You may have misnamed it or it may be in the wrong folder.