Palo Alto Networks VM-Series firewalls require valid licensing to provide security services. Using unauthorized "cracks" or bypassed licenses for enterprise security software is highly discouraged due to significant legal, security, and operational risks.
Legitimate alternatives I can help you with instead:
Understanding Palo Alto VM License and Potential Risks
That being said, I'll provide some general information on Palo Alto Networks and their licensing model.
Alternatives to Licensing