Requirements Windows NT/2000/XP Poser 5 Maya 4.0, Maya 4.5, or Maya 5.0 BodyStudio 2.0 is for Poser 5 only. For use with Poser 4, purchase BodyStudio 2.0 and there is an automatic download of BodyStudio 1.0 available You didn't specify which version of poser you using, but thier web page clearly states that for poser 4 you need v1.0 of the plugin. v2.0 is for Poser 5 only. ya also need NT/2k/or XP operating systems. I'm sure ya already know this, but sometimes, people sometimes miss the fine print. Just tryin to help out, I don;t use their plugins nor Maya.