Changelog - LimeWire

I did not suggest upgrading LW.

Improvements of LW 5 over 4? LW 5 has been re-built from ground upward to prevent over-coding, crowded window views, and to generally improve each function.
LW 5 opens & loads much faster than LW 4. Connects much more easily and much faster. LW 5 has various search result filters that LW 4 did not have such as size filter. Search has some improvements to fix a bug which existed in LW 4. Separate view for what is shared. Download window is viewable at all times unless you choose to view Uploads & easy switch between each of these. Option for sharing with friends (this has replaced Direct Connect.) Player is upgraded in abilities & improved, can now even view videos. Player playlists can be saved & link retained on main window viewable at all times. Library/Shared easily set to view only particular media type. Easier to add shared files & folders & decide which media types from these should be added. Better & upgraded iTunes support. Better torrent support & options.

There's more I'm sure but this is a quick list of improvements.