VAG-COM-FAQ-3.7
From Ross-Tech Wiki
3.7 How do I permanently move VAG-COM from one PC to another?
All of our Current Interfaces have Activation built-in, so you can download and install VAG-COM onto as many PC's as you'd like, so VAG-COM is fully Registered and Activated once you test it on a car.
If you have a "dumb" interface that does not have built-in Activation see this page: 5.1 How do I permanently move VAG-COM from one PC to another?