First, it appears that http://www.interactivestudio.sk/, the people who made the Gameport accounting client/server system for use in internet cafes and such... doesn't exist any more. It is actually available. So, it's not being developed at all, anymore.
One of the last major reports on it, and security vulnerabilities within it, was back in 2004.
There does not appear to be a client written to be installed on an XBox anywhere out there. So, with no further development on the software and no client for the environment you want to use, you are pretty much out of luck.
Don't be fooled into thinking that it's still supported, just because you can find some download sites that still have it available.