Did you try it with the free A8 Version as well?
You could export the level as mdl and then open it in MED and export it from there to 3ds - sadly you won't have any texturing then - as far as I know.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt