Instead of looking for a crack, consider these safe options:

You will have zero access to technical support, documentation, or security patches from GFI Software, the creators of Kerio Control [1, 2]. Safe and Recommended Alternatives

Using unauthorized software is illegal, violates end-user license agreements (EULA), and can lead to legal action or fines for businesses [2].

Look for legitimate free, open-source firewall solutions if budget is a constraint, such as pfSense or OPNsense .