"C:\Program Files\Tenable\Nessus\nessuscli.exe" fetch --challenge /opt/nessus/sbin/nessuscli fetch --challenge /Library/Nessus/run/sbin/nessuscli fetch --challenge 3. Complete Offline Registration Take the newly generated Challenge Code Activation Code to a computer with internet access. Visit Portal : Go to the Nessus Offline Registration page Submit Codes : Enter both codes to generate your nessus.license file and the unique link for plugin updates. Apply License
If the server sees that fingerprint already has an active license—even if that license is technically on a different installation of Nessus on the same machine—it returns the error. nessus offline activation license already in use