Really? Eh, I've been using TFTDextender and other Windows patches for so long that I've forgotten these details.
Sorry.
Anyway, have you determined whether unconscious aliens actually bleed? Because I realized that I MC most aliens before they fall unconscious - my favorite trick is to MC ones with disruptor pulse launchers and then make them shoot into wall, preferably to catch others into the blast. Thus I'm not sure whether the aliens didn't bleed because they counted as MC'd while uncounscious or whether it was a separate bug.