Hmmm, ok, the Stormy Rain product sold here in Renderosity consists of the models in *.3ds file format - these can be used in Vue and in Poser 6 and 7. 

With regard to the sets of raindrops that you can animate, apparently I removed the versions for Vue from my web site. No downloads for a long time, so I took them off. However, if you go to the download link given below, you can download some simple versions that I made for Poser people. These are both in *.obj file format, but you can import them ito Vue.

http://www.expandingwave.com/downloads/w_long_rain/

You'll want to assign them the Clear Water material. Basically, just pose the bottom of this rain object on the terrain, and then make a very straightforward animation so that the object moves downward in front of the camera.

If you want anything more elaborate ( a longer mass of water objects, more dense rain, and so forth), just send me an e-mail at forester@mountainflight.us