Excellent ! I think this may be the solution to the problem ^^

go to http://www.3dgamestudio.com/download.php

and then download the
"Gamestudio / A8 (free version / trial version - V 8.10 - ~100 MB - December 2010)"

and then activate it ! Most likely the problem occured because you used 8.03 instead of 8.10 ! It's nonetheless a bit misleading that you didn't get a download link to the newest version !

get the C# wrapper:
for A7.85.4 and A8.30.4, Version 2.3.9
at http://acknexwrapper2.matthias-auer.net/ or visit the thread