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The "all-20.targz" file is a compressed tarball containing a collection of Nessus plugins. The "all" designation indicates that this file includes plugins for scanning a wide range of targets, including various operating systems, web applications, and network devices. The "20" likely represents the plugin set's version or release number. Downloading files like nessus-update-plugins-all-2
Offline Requirement: Systems in high-security segments cannot "call home" to Tenable's servers for updates. including various operating systems
Tenable offers a completely free version called Nessus Essentials (formerly Nessus Home). Here is how to use it without ever needing a shady nessusupdateplugins download: