The reason that the addin is not available on the vCampus Download Center is because PI BatchView and the PI Batch Generator Interface (PIBaGen) are not provided in the vCampus PI Products Kit.
You can try accessing the Virtual Learning Labs Environment which provides you a virtual environment with PI System that you can access online. I have not had the opportunity to see if PI BatchView is installed, but chances are it is. The access to Virtual Learning Labs is included in OSIsoft vCampus subscription and you can access it from the Training Center as well.
You can download the Batchview addin from the techsupport site. Bear in mind that Batchview is seperately licenses, as far as I'm aware. This means that you need to talk to your sales person if this isn't part of your license. OSIsoft is pretty good about arranging temporary licenses.