2) In the wiki should be some info on this, too
3) Because update 6.22 needed DirectX 8.1, but now the version 6.31.4 needs directX 9c

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