The plugins of Forest 2 for max 2009, includes Planes Material as well, and it's compatible with old scenes. What error do you get exactly ?
If you like, with FP 3.03 also is possible to import automatically libraries of Planes Material, and add the items to the Library Browser (see the video tutorial on our website), but if i understand your question, you want to use Planes Material with objects of Forest 2. Is this correct ?