This is the secret sauce. Nessus checks timestamps. Use the command:
"If I paid for a license, I should be able to run it in my SCADA lab that has no Wi-Fi. Tenable's forced online check is anti-competitive." nessus offline registration hot
The search term has been trending heavily across InfoSec forums (Reddit r/netsec, Stack Overflow, and Tenable Community) because it solves a critical pain point: How do you activate Nessus when the scanner has zero internet access? This is the secret sauce