Instead, consider using the free trial or Nessus Essentials to get started with the scanner. If you're interested in using Nessus for commercial purposes, I recommend purchasing a license from Tenable or an authorized reseller.
Searching for "cracked" or "full version" downloads of professional security tools like Nessus is a common path that often leads to a cautionary tale rather than a free lunch. Here is the "interesting story" of what usually happens when users try to find a cracked version of this software. The Honeypot Trap nessus upd cracked version download
: This is the leading open-source alternative to Nessus. It is a full-featured vulnerability management suite that is completely free and updated regularly by the community. Instead, consider using the free trial or Nessus