I sent you a message in reply to your e-mail, but in case anyone else also gets a blank cd (wtf!) you can download the whole installation package here:
http://www.atarimax.com/usb5200/
Just scroll down to the bottom of the page and there is an exe installer here.
Install the software first, then plug in your cartridge for the firs time.
Installation will go a little different since you dont have the drivers in the root directory of the CD.
When it prompts you for the location of the drivers you will have to 'choose location'. Then navigate to the installation directory and location the file usb5200.ini, it will be in the subdirectory 'drivers'.
After that installation should proceed normally.
Steve