When I download Pro, I control-click the link, then hold down the option key to get Safari's "Save As" dialog.

That way I can name the installer with the version, and don't have to worry about which one it is.

However, Safari won't overwrite an older installer--it will just change the name to something different.

So, unless you know you trashed the old installer, try a Spotlight search for "LimeWireSoftOSX" or "Lime OSX" and see what comes up.