I got around this by faking the UserAgent...
the client is generally for Windows laptops. Linux and Mac OS X were exempt. While a Mac guy, I had a Windows Laptop... so fake the useragent, and bypass the stupid app. It registered my MAC address, and I was good for the semester.
Simple as can be.
You can call tech support and ask how to get a BeOS computer on the network. See what they tell you.