as you know there is no 64 bit build of dfengine
. so playing the quake 3 defrag mod with ioquake is a pain, as every missing pk3 has to be downloaded manually, or with very slow download speed, because http downloads are not supported.
the solution lies in iodfe
just copy the "iodfengine.i386" file from this archive
into your ioquake3 installation folder, make it executable and run it.
for the http map download to work, set:
if you are connecting to an MDD defrag server
the maps will be downloaded with high speed from the q3a.ath.cx
map archive, instead of the server itself.