I too experienced the same problem when installing from the
latest LimeWire install application. I noticed that I was running LimeWire
in the background so I quit it. Then tried to Install. Same "Corrupt File" message.
Then I rebooted, and tried to install again with a "fresh" Mac.
Voila! It worked.

I then tried it again, just to test the experiement. When I tried to run the Installer
on a Mac that was previously running any version of LimeWire, the file would not
install. Once I rebooted, and tried again, it would launch the installer.

It appears the Installer looks at either the current version of JAVA or something in
prefs folder and finding that file in use, it fails the installer causing a "corrupt" message.

Hope this helps.

Clownfish