Please support Ross Tech by using their software and buying their genuine cable. They've invested many years into the software development that allows us enthusiasts to diddle with our cars at length. I bought my first Ross Tech cable in 2001 or thereabouts, updated it a few years ago...one of the best tool investments I've ever made.
Of course, I also have four VAG products in my driveway.
...so I get to amortize the cost over multiple cars and many, many miles!