Macintosh Current version is 1.2 helldrop.sit	IBM Compatable Current version is 1.2 helldrop.zip
Other stuff you will need
DOOMinator doominator2.bin	DeHackEd dehacked3.zip

Version Comparisons

Mac 1.0 = PC 1.0 & 1.01

Mac 1.1 & 1.1.1 = PC 1.1 & 1.1.1

Mac 1.2 = PC 1.2