There are two offical versions of Pivot Stickfigure animator. The old good 2.25 and the quite new 3 beta.
Pivot 2.25 dowload:
Click here
Pivot 3 beta dowload:
Click here
The unpopular Pivot 1:
http://www.megaupload.com/?d=E5F6MAL7
Most of the people here have Pivot, but this is for those who don't.
Thanks.