First, you need to get the unique hardware string from your offline Nessus installation.
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If you have landed on this page, you are likely a cybersecurity professional, a penetration tester, or a system administrator managing Tenable Nessus. You have probably typed the long tail keyword into a search engine out of frustration—perhaps your Nessus scanner is stuck with "compiling plugins," your trial license expired, or you are trying to update an air-gapped system without internet access. First, you need to get the unique hardware