RayOchoa, I had exactly the same problem before SU7 came out.
http://www.sketchucation.com/forums/scf/viewtopic.php?f=15&t=1897&p=31500&hilit=+converter#p8826
Now that I use version 7, it's not a problem for me anymore..
DeepExploration can save into any version of SketchUp (from v3 to v7), and you can use it's batch function to convert multiple files at a time. However, it messes up texture maping of textured SU models. It costs quite a bit too, but you can use trial version for a month without restrictions. It's good in every other way though.