Wireshark Installer hangs in the screen “Preparing for installation”, it does not throw any error. Wireshark requires x windows, but moutain lion does not ship with X11. You need to install it separately.

http://support.apple.com/kb/HT5293 http://ask.wireshark.org/questions/12140/cant-run-wireshark-in-mac-os-x-mountain-lion

I spent quite some time to figure out this, as there is no post related to this. Hope you find it helpful. Watch the following video for detailed explanation on wireshark installation.

http://www.youtube.com/watch?v=RkJt6JdtnOU