nithin_axis

I also faced the same issue and here is the way I solved it.

in class-wp-splash-page.php file add new function

public function get_cookie_name() {
		return $this->cookie_name;
	}

Then edit wp_splash_page_generate() in init.php as follows

function wp_splash_page_generate() {

	wpsp_import_class( 'WP_Splash_Page', 'inc/class-wp-splash-page.php' );

	$wpsp	= new WP_Splash_Page();

	$cookieName = $wpsp->get_cookie_name();

	if ( $wpsp->is_active() ){
		$wpsp->splash_page();
	}
 	else{
		unset( $_COOKIE[$cookieName] );
		setcookie( $cookieName, '', time() - ( 15 * 60 ) );
	}

}