This website is for 3d gamestudio.

Download this:
http://www.conitecserver.com/down/gsdemo.exe

3D GameStudio/A6 Trial Version (35 MB, Version 6.31 - November 2004)
Try before you buy! Test it for 30 days. Some restrictions apply. Publishing is disabled.
• For getting started, download the Game Design Tutorial for learning the basics of level making.
• For old Windows versions prior to XP, update to Microsoft Accessibility 2.0 for the GameStudio editors.
• If you have an old DirectX version, update to Microsoft DirectX 9.0c for the GameStudio engine.


Go here for more:
http://www.conitec.net/a4update.htm