The downloaded .dmg.bz2 file appears to be corrupt. Why?
NOTE: on May 22, 2008 we made a change to our web server that seems to have worked around this Safari bug. It is a known bug in Safari on Mac OS X that it sometimes adds file extensions to downloaded files. In this case, it is adding a .bz2 file extension when there should not be one. You can fix the problem by renaming the .dmg.bz2 file to have extension .dmg.