commercial game engine export

Hey, I am working on a mod. A mod I must say without a home. I have been using sauerbraten to test and play with my models but the reality is that the engine is just too lacking to do what I want, and I am not a programmer. So I need an engine that already has the functionality.

I’ve dug around and found an md5 exporter, and this .smd exporter http://www.moddb.com/forum/thread/blender3d-hl2-smd-export-115cript.

The thing is that Valve is coming out with “left 4 dead” and that is really the kind of co-op thing that I really want to work on, and the .smd export script does not seem to work.

Is there someone that has a minute to see if it is a simple fix??