Actually, Visual Composer only available on Landing Page – Visual Composer template and Portfolio Item with Extended Layout.
You will not need to using license keys to updating those plugin because we’ve been bundled the plugin files with these theme jkreativ-themes/plugin/js_composer.zip. You can take a look at our documentation about updating required plugin right here http://support.jegtheme.com/documentation/themes-plugins-update/
Please try to increase php execution limit time & wp_memory_limit (wp-config.php). May be you need to contact your hosting provider in order to change those configuration.