In the file admin/rtwwdpd-class-woo-dynamic-pricing-discounts-with-ai-admin.php comment out line 834 which is:
$response = wp_remote_post( 'https://demo.redefiningtheweb.com/license-verification/license-verification.php', $args );
Change line 844 from this:
$response_body = json_decode( $response['body'] );
To this:
$response_body = json_decode('{"result":true, "message":"Activation Successful!"}');
Now use any key you like to activate the plugin.