Support for Stone Age 2 was removed by Aeria in August of 2009. It wasn't the most well received title, granted it did have some support, so I believe it was just lack of interest that made that decision.
Honestly, I'm not too sure there are many people around who worked closely with it. ittoujuu
was the one of the Game Masters who worked the closest with it, I think. Unfortunately you likely won't be able to contact him.