Ensure the license key is not actively compiled on another online scanner. Offline keys must be registered specifically for offline use.
Log into the Nessus web UI (port 8834). Go to Settings → About → Plugins . The “Plugin Date” should reflect the timestamp from your tarball. download nessus-update-plugins all-2.0.tar.gz
Works with Nessus Professional, Managed, and Essentials versions. How to Download Nessus Plugins Manually Ensure the license key is not actively compiled
/opt/nessus/sbin/nessus-update-plugins