How registration works for SEFAUtil Server:

When a key is requested, a trial period for all features will be created for 30 days.

Set-SefautilServerRegistration –Name YourOrgName – –PhoneNumber YourPhoneNumber –Implement{Press {Tab}

If the server doesn't have internet access, you can manually get a trial key by emailing and requesting one.

More details on installing & registering SEFAUtil Server:

How to register SEFAUtil Server after you have a registration key:

Set-SefautilServerRegistration –RegistrationKey “{key here}