I had emailed tech support for Archicad last year, and they told me to post on talk to get developer to respond. Well that didn't work.
I was able to get landmark in- only 1. No polylines, etc. I really wanted to pull in polylines to get lines for trees location, but I don't think this was ever looked at. I was able to save out of AC9 1 building only to GE. Unfortunately, my project is many buildings and roads. I guess I could try saving as some Autocad 3d file, then open in sketchup to export, but I am not a Sketchup user.
This is very disappointing that no one seems to care to make this available. They should delete the add-ons rather than lead users to believe this is possible.