Avast, like most modern cybersecurity companies, uses a server-side verification system. Even if you find a "key" that was valid for another user, Avast can blacklist it instantly once they detect it is being shared or used on multiple devices. You might install the software, input the key, and find it disabled a few days later.
Avast offers a fully functional 30-day free trial of AntiTrack Premium. This is the best way to test if the software suits your needs. You can download it directly from the Avast website. avast antitrack key
Privacy software is useless if it isn't updated. Tracking technology evolves daily. A cracked version of Avast AntiTrack usually blocks the software from connecting to Avast’s servers to download essential definition updates. This leaves you with a program that provides a false sense of security while failing to stop modern trackers. Avast, like most modern cybersecurity companies, uses a