I traded in Ai8/Mac CD to Adobe Store Japan for Ai CS4/Win and placed an order for free UPG to CS5.
So, here's Metaball plug-in built with CS4 SDK and tested with Ai CS4 / Windows XP SP3.
It doesn't contain any new feature.
This is a beta software. Please use it carefully, at your own risk.
For more information, please read the included readme file.