I believe you should find your answer in this discussion thread. As explained by Steve, PI Webparts 3.0 is on limited release and hence you can only request it through our Techsupport Team. In the vCampus PI Product Kit, you should find the install kit for RtWebparts 2.2 (this is the name of the product before we rebranded it as PI Webparts)
We believed that the rebranding only started with webparts 3.0.
Thank you for clearing this up