Index: branches/Ver2.4/xpressme_integration_kit/wp-content/plugins/xpressme/include/class-xpress-upgrader.php
===================================================================
--- branches/Ver2.4/xpressme_integration_kit/wp-content/plugins/xpressme/include/class-xpress-upgrader.php	(revision 805)
+++ branches/Ver2.4/xpressme_integration_kit/wp-content/plugins/xpressme/include/class-xpress-upgrader.php	(revision 808)
@@ -42,9 +42,9 @@
 			return $working_dir;
 		$kit_dir = $working_dir .'/xpressme_integration_kit/';
-		if (!file_exists($kit_dir)){	// search sub dir.
+		if (!$wp_filesystem->exists($kit_dir)){	// search sub dir.
 			$kit_dir = '';
 			$subdirs = $wp_filesystem->dirlist($working_dir,false);
 			foreach($subdirs as $subdir){
-				if (file_exists($working_dir .'/' .$subdir['name'] .'/xpressme_integration_kit/')){
+				if ($wp_filesystem->exists($working_dir .'/' .$subdir['name'] .'/xpressme_integration_kit/')){
 					$kit_dir = $working_dir .'/' .$subdir['name'] .'/xpressme_integration_kit/';
 					continue;