Since standard activation is disabled, you have three primary paths forward: 1. The "Nitro Pro 12" Workaround
Enterprise deployments of Nitro Pro 9 often bypass the GUI activation. IT administrators use a command-line interface or a configuration file ( .mst transform file) to inject the serial number during deployment.
Nitro typically offers a or more to users of "sunsetted" versions like Nitro Pro 9.