limewire install isn't opening.

I am running on OS9.2 and it sucks, and stuff. I have one version of installed open-able limewire, but I haven't downloaded the update in forever, so it won't connect or download anything. So, I downloaded the update, and when I double click to install it, I get an error messege saying, "LimeWireMac.bin cannot be opened because the application that created this document could not be found."
I have a feeling it might be a computer issue, because I've gotten that error messege before, but I'm not sure because I know close to nothing about computers, ha.