I've uploaded two installer sets for CORE 0.30 in ZIP format, on behalf of our Mac fans. I do hope they work, as we're unable to test them... They're basically ZIPs from the directory structure which the regular installer creates.
CORE 0.30 for Doomsday ZIP
CORE 0.30 for Armageddon ZIP
CORE 0.30 for Doomsday ZIP
CORE 0.30 for Armageddon ZIP