Every CD of RS-BA1 is *licensed* software. Each CD comes with a "license key" tied to that particular CD. This is probably why you can't just download it.
Just wait until you try to figure out the instructions. It's easy to see it was translated from Japanese and my only advise to you when you do read the instructions is to print them out, read them from page one to page last, highlight the sections which apply to your specific situation and what you're trying to accomplish, and red-X the sections that don't apply. Pencil in all data that you plan to enter as you read through the instructions (highlighting the steps appropriate and red-xing the sections that don't apply) before you actually start setting it up. Then make appropriate changes to your penciled notes after you realize what they're asking you to enter (like changing some descriptive names to make them more descriptive...) Then do it... step by step.
It's repetitive and the terminology used is not standard networking terminology.
If you don't have a basic understanding of how the internet works, prepare to get frustrated. (IP addressing, ports, firewall-on both sides, host name(s), etc.) And get help from the start.
If you are an internet engineer, prepare to get frustrated. I'll tell you how to *not* get frustrated as an internet engineer: Follow the instructions step by step. It doesn't follow the typical steps a network engineer would follow to set something like this up. (User registration first, then radio registration... what? yes, in that order...) That is probably the most important lesson I learned.
They call the "server" part of this software the "base station PC" and the "client" part of this software the "remote station".
It works well once you get it working! (I remoted my 7300 with it.)
Good luck!