Since WordPress 3.7 automatic backgrounds updates are available, for themes, plugins, translations and core. CSS Plus have any minor updates, such as maintenance and security releases. We recommend you apply these updates.
Follow this method:
Configuration via wp-config.php
If you want apply automatic backgrounds updates for all content that you have, just add this code in your wp-config.php file:
define( 'WP_AUTO_UPDATE_CORE', true );
Note: search for this code and delete them for avoid conflicts:
define( 'AUTOMATIC_UPDATER_DISABLED', true );
Since, CSS Plus 1.5 automatic updates are available inside core plugin. If you have understand the science behind this technology, click here. And, if you have any questions send a request by comments or form contact.