plugin not updating correctly

i have updated the plugin but am getting a message "WP Smush Pro
You have version 2.4.3 installed. Update to 2.4.2. View version 2.4.2 details.
Compatibility with WordPress 4.5.3: Unknown
-Fixed: PHP 5.2 Compatibility " also all images that were previously smushed are now being smushed again, i have this issue on a couple sites , both are hosted on wpengine , i have cleared cache and reset file permissions , i am not using the dashboard, i have added the required code already to the wp-config.php, is there an issue with this plugin working as a stand alone plugin without the dashboard ?