Here is the technical paper/guide on how to perform this action.
sudo or as root. Unpacking plugins requires writing to system directories.all-2.0.tar.gz.gz). Browsers sometimes add extra extensions during download.all-2.0.tar.gz file is large, and the unpacked plugins are even larger. Ensure you have sufficient disk space on the partition where Nessus is installed (usually /opt or /usr/local).: Tenable releases plugin updates daily. For offline systems, administrators must manually download the latest archive from a machine with internet access. Verification : It is critical to verify the file using the MD5 checksum download nessusupdateplugins all20targz top
Here's what each part seems to do:
If your Nessus scanner has access to the internet, you do not need to manually download the .tar.gz file. The utility does the work for you. Here is the technical paper/guide on how to
Manually updating Nessus plugins using the all-2.0.tar.gz archive is a critical procedure for security professionals operating in offline or air-gapped environments where automatic updates are not possible. Understanding the Plugin Archive all-2.0.tar.gz Permissions: Always run the command with sudo or as root
Or for more specific management, Tenable provides a feed repository that might be accessed through their official API or directly through the Nessus interface.