No company is supposed to be distributing our software on a disk. So, already you can see that your choice of vendors is not exactly primo! The vendor chooses to ignore the rules and do their own thing.
VCDS-Lite is the free version of our product that should be compatible with any product that claims to work with VAG-COM version 409. We replaced VAG-COM 409 with VCDS-Lite so that it would be compatible with Windows XP, Vista and 7. You can go our website and download this product for free and run it in the shareware version. If you like what you see and you want more capability, then you would do as Dana directed and buy a full license for VCDS-Lite for $99 USD.
You asked earlier what can be done: You can read and clear fault codes. You can view live measuring values. With the full license, you can perform the basic settings and adaptations, code modules and so on that dealer techs do on your car if you have them service it.