This thread is talking about Fritzbot ET not Fritzbot for RTCW. The maps you are referring to are for the
RTCW version. If you have installed a RTCW pk3 in your ET/fritzbot directory it won't work (so remove it). If on the other hand you are talking about the RTCW version of Fritzbot installed in your RTCW game directory then there still are places to download from like;
Wolfenstein City
RTCW Forever
and the old standby;
Filefront