@viva3 shared a tip to get through.
Let's do it.
This solution still works:
** HOW TO SOLVE The issue of asking for license key**:
1. Open the file in main folder - 'permalink-manager.php'.
2. In between the line of
'if (!defined('WPINC')) {
die;
}'
and
'if(!class_exists('Permalink_Manager_Class')) {'
Add the below code.
$permalink_manager_options = get_option( 'permalink-manager', [] );
$permalink_manager_options['licence'] = [ 'licence_key' => '**********', 'expiration_date' => time() + 365 * 24 * 60 * 60 ];
update_option( 'permalink-manager', $permalink_manager_options );
I don't understand why some people don't just try out previous solution before complaining.