The easy way is to install one of your older versions(A7) and copy the fbx dlls from the med_plugins folder to your med_plugins folder of A8.
I never did that because I have several versions installed anyway and use an old version of MED, when ever I need the fbx import.

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