Downloading a bzip2-encoded dmg -served as application/octet-stream using Safari/Webkit results in a .bz2 file that cannot be opened correctly. Removing -in the Finder- the .bz2 extension (leaving one with a .dmg extension) allows the user to proceed.
1. Go to mentioned site
3. go over to the Finder attempt to open the downloaded .dmg
See also: https://bugzilla.mozilla.org/show_bug.cgi?id=408233
Also filed as Bug ID# 6032836 with bugreport.apple.com
This is not a WebKit issue, so I'm closing it as INVALID per our process. This will continue to be tracked internally by Apple as <rdar://6032836>, thank you for reporting it!