Nessus Offline Activation License Already In Use [upd]

Since you are performing an offline activation, Tenable’s servers believe the code is active on another machine. Tenable Community Portal Navigate to My Products and select your Nessus subscription. Find the specific Activation Code you are trying to use. Manage/Reset

Set static MAC addresses on virtual networks to keep your challenge code from changing unexpectedly. nessus offline activation license already in use

You uninstalled Nessus and tried to reinstall it on the same machine, but the server didn't "release" the old hardware ID. Since you are performing an offline activation, Tenable’s