LW 5 is equivalent to a Beta version even though they removed that tag. It was definitely not ready for full release. I already made my thoughts about that known to them. Releasing a version that is lacking, has bugs, no comparison to the previous LW 4.18 for example. What more can one say. Lime Wire » Download Out-Of-Date Installers

Clean installation technique: http://www.gnutellaforums.com/333278-post2.html but use the above link for LW version installation link.