Quite possibly they developed it when maya 6.5 was out and used that platform to test it.
Email them and ask if it works on version 6.0x

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Examples of bTraffic - a traffic animation tool for Maya
bFlocking - a tool for Maya 8.5+ to generate flocking and swarming behaviours
Jan/Feb Challenge 2007 Entry and W.I.P
May/Jun Challenge 2006 Entry and W.I.P
Mar/Apr Challenge 2006 Entry and W.I.P
Jan/Feb Challenge 2006 Entry and W.I.P
Nov/Dec Challenge 2005 Entry and W.I.P
Sep/Oct Challenge 2005 Entry and W.I.P
Jul/Aug Challenge 2005 Entry
www.flash-fx.net