Sigh ... it's impossible to make a card with 100% compatible DS Download Play for all games. Obviously, some of you don't even understand how the system works.
There are two solutions:
1. Flash your co-players DS (a matter of five minutes, really)
2. Go and buy the original game
Maybe sounds too harsh, but that's how it is. It's impossible. Period.
Obviously you have never heard of DS-Xtreme you mook.