Force license key
The license key and email are normally added via the dedicated fields in the interface.
However, you can also use PHP constants to add them via code.
Simply declare these two constants in your wp-config.php configuration file:
SECUPRESS_API_KEY : your license key
SECUPRESS_API_EMAIL : the email used to purchase the license
Example:
define( 'SECUPRESS_API_KEY', '21not065a823real578264key9052' );
define( 'SECUPRESS_API_EMAIL', 'contact@secupress.me' );
The Pro version should then be active, and the dedicated fields will disappear from the interface.