You need to click on the Old Versions link on right-hand side. This post has a sample image: http://www.gnutellaforums.com/mac-os...0-5-later.html

If you already installed LW 5 by mistake, drag the program to trash. Then go to OSX -> Library -> Receipts folder, view it in list mode & scroll down to i & look for install limewire.pkg file & drag it to the trash also. Then install LW 4.

(the newer install limewire.pkg file would prevent you installing LW 4 otherwise.)