The "Could Not Download; Awaiting Sources" messages is not caused by a bug. It's the intended response to a failed download that replaced the "requery sent, waiting for results" message.

The upcoming LW 3.0 (and possibly all future versions) will behave similarly. Returning to LW 2.8.6 will not improve your situation on the long run, because it's not really compatible to the new search architecture.

LimeWire 2.8.6 will try to requery for failed downloads but those searches are now dropped by newer ultrapeers. So although you don't get the "Could Not Download" message, your situation will not have changed.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob