In my version of Limewire, in the "search" tab, there are 3 buttons at the bottom, on the left: "keyword", "what's new" and if I click on the arrow, the 3rd button will appear, it says "direct connect". Maybe you can use that function to connect to the host you found. Try typing the IP address followed with the port number (very often, it's ":6346").
I'm not sure if this answers to your question. Hope this will help you.

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About me:
- Mac OS 10.3.8
- eMac 1 GHz, PowerPC G4, 512 MB SDRAM
- Limewire 4.6.0 Pro
- Internet connection: 2 Mbps (cable)