Instead of seeking cracked versions, consider the following:

An outdated scanner is a useless scanner. C. Inaccurate Results and False Negatives

The story of a "Tenable Nessus Professional crack" is a cautionary tale about the high hidden costs of "free" security software. The Temptation of the Shortcut

"Cracked" cybersecurity tools are frequently used by attackers as a Trojan horse to infect the systems of security researchers.

Tenable provides several ways to use Nessus for free or for evaluation without risking your system with untrusted "cracked" files: