Maybe talk to some server hoster you know ( f.e. Obama from evil or whatever ) Maybe it's because of the dir tree. I mean you have to upload a baseoa dir with all maps. And a dir "oanage" with the mod. If it looks like this:
http://yourwebspaceformaps.com/ftp/baseoahttp://yourwebspaceformaps.com/ftp/oanageyou have to put
http://yourwebspaceformaps.com/ftp/ in the server cfg as dl url. ( if i remember it correctly )