Sorry - guess I didn't read your OP properly

Songs downloaded with LW 4 don't show as previously downloaded for me. And whereas a search would once show a checkmark beside a file which you'd added for sharing & that someone else had downloaded (eg a file ripped & added to the shared folder), that doesn't show in LW 5 either.

Ask at this other forum, where the developers answer questions: LimeWire 5 - LimeWire Forums

They'll be able to give you a definitive answer