Ok, I finally get it to work but memory costs are pretty high if you generate to much and importing is quite slow.
I still need to test other ivy gen 2012.
I have found that even the 64 bit version of Wings3D will crash when importing high polygon count models, like those from Ivy Generator. So that said, here is my work around:
First, create the model I want to grow Ivy on in Wings3D, Duplicate it, then use the Tesselate tool to triangulate the duplicate. Export that after the tesselation operation is completed.
Next open Ivy Generator and import the triangulated model. Grow some Ivy on it, get it ready to export and export the Ivy Model. I Do not import that into Wings3D! As Wings3D is mainly a modeler and UV Map generator, there is little reason to have a plant model using up valuable memory in the software. Rather I finish the non-triangulated version by UV Mapping it, adding Material zones and exporting it.
I then import that model and my Ivy model into the program I wish to use for staging a scene, add the right textures to each, and complete my scene with whatever else I want in it. Then I render the whole thing.
Once the Ivy has been generated, it will fit either version of the model it was grown on, as long as you have not added or subtracted anything on the model. Personally I use DAZ Studio more often than any other application for my scenes.