I'm pretty sure there's an MD3 Exporter script floating around online somewhere. AFAIK it works with Max 2008, since maxscript tends to be way more portable than plugins.
Oh that's interesting... I can only put the "hit and miss" statement down to "pilot error"!. I don't use Max myself but have often got feedback from users saying the scripts aren't/don't work properly sometimes.. I can only conclude from that that they're not being installed correctly? And yes, no idea what happened to…