Search your inbox for a message from Tenable. This email typically contains your initial activation code and download links.

trials, Tenable often filters out generic providers (like Gmail or Yahoo). Using a company or academic email

Codes are generally for a single scanner and valid for one-time activation. 24-Hour Limit: Most codes must be used within of being issued. Internet Required:

However, the process for obtaining a code differs depending on whether you are using the free or the commercial Nessus Professional .

Activation typically happens during the initial setup or via the settings menu in an existing installation: Install Tenable Nessus Offline

at no cost, which often provides higher scan limits than the standard free version. 3. Locating an Existing Code