If you are trying to run this software on Windows 7, driver compatibility is the biggest hurdle. The software itself may run fine, but getting Windows 7 to recognize a legacy Serial-to-USB adapter often requires manually installing older drivers.
Audi VWTool 2.0.9 is a vintage diagnostic software designed for Volkswagen Group (VAG) vehicles, primarily used to access and modify parameters for engine, transmission, airbag, and ABS systems. Software Overview Audi VWTool 2.0.9 for Windows 7 English.71
: The industry standard for VAG diagnostics, offering much broader support for newer vehicles and 64-bit systems. If you are trying to run this software