Using a key generator or "crack" for security software is counterproductive and dangerous:
If you have already purchased a subscription, you can find your activation code in the Avast Account portal or within the application under Menu > My Subscriptions Official Activation: Avast key - Generator
Avast offers a fully functional 30-day trial of Avast Premier or Avast Internet Security. No credit card is required for the trial. Use it for a month to see if you need the extra features. Using a key generator or "crack" for security