I just downlded it without problems with Safari 1.3.1(v312.3.3) on 10.3.9. It mounted fine. I'm not sure why my Safari version is slightly different to yours. Have you checked for any Safari updates. Check your Software update program to see if there's any Safari updates. Not sure if this will make any difference or not.
Safari update & then (edited! I shouldn't give a direct link to downld url!)