It may “work” because the crack blocks Avast updates. Without updates, you’re vulnerable to new threats from yesterday, today, and tomorrow.

If you want, I can instead:

This article is for educational and security awareness purposes. Using cracked software violates Avast’s terms of service and may be illegal in your jurisdiction.

Using a cracked key violates Avast’s EULA. While individual users rarely get sued, businesses face fines for license non-compliance.

Which of these would you like?