Software is useless without hardware. VCDS Lite 1.2 requires a (OBD-II to USB) using the FTDI FT232RL chipset. Cheap Chinese "blue cables" work, but quality varies.
Ross-Tech provides a specific process for legally registering and activating the software to reach "Full" status: Vcds Lite 1.2 Full Registered Activated UPD
Best suited for pre-2006 models that use a K-line connection rather than a CAN-Bus. Software is useless without hardware