Help!

I purchased LimeWire and now get the message to upgrade, but the installer is always corrupted :/ Ive downloaded countless times, both from IE and from AOL. I have even tried going back to the free version and downloading that file. It gives me the same installer file that is missing a component and will not work. When I click on the installer, I get a dialog box that says:

While trying to start the next step of the installer, an error occurred. Could not find the file 'InstallAnywhere installer'. Please contact your software vendor.

What steps should I take now? Why cant I seem to download the new version?