I have ProAnimator for Motion and it works great unless I import a 3D model. It will just crash the program after a change or two. I have After Effects so I downloaded the free trial of 3D Invigorator Pro. It can't import any of the 3D models at all. Here is a link to the free model: http://www.modelplusmodel.com/tech/f10-phone.html
If possible, try downloading the models in the ".obj" (Maya) format. Or, you can also try the ".lwo" Lightwave format. Both formats work best for our program. If the format doesn't exist, sometimes it's possible to request the author to provide an alternative format in .obj or .lwo.