When it unzips, all I see are two "Memico.cgz" files, and no "memico.ogz" or "memico.cfg". Is there no map in the .zip file, or did you just misname it, or is the file corrupt?
Well, I got that to work. But now Sauerbraten quits whenever I try to open the map. (Actually, I have that problem with a few maps I downloaded recently. Only some, though.)