I read that even though the version number is slow updating, the download itself is actually the latest version (when installed, "About Limewire" will show the actual version).

The files can also be had from http://www3.limewire.com/download/ , but download the installer you need by date modified (the ones at the bottom of the list): the large file inside the "3.6.15" folder contains the installers for ALL platforms.