Answer:

A New Extended Key is a code that may be used to activate Foxhound Version 4 as an Extended Edition copy after

• installing a fresh copy of Version 4 (without upgrading from an existing copy of Version 1, 2 or 3), or

• upgrading an existing copy of the Version 4 Rental Edition.

The "New Basic" and "New Extended" prices apply to fresh installations of Foxhound 3 where no previous Foxhound database is available to be read by the Foxhound 3 installation process.

You can purchase a New Extended Key here:

See also...
What is a "New Basic Key"?
What are the differences among the different editions of Foxhound: Rental, Basic and Extended?
What are the differences among all the activation keys?