Thank you for reaching out to us. To run an update, visit Dashboard > Updates in your WordPress dashboard. Automatic updates checks every 12 hours for new versions that may be available. You can manually check by clicking Check Again on either the X or Cornerstone home page. Please note that to enable automatic updates your product should be validated please see https://theme.co/apex/forum/t/setup-product-validation/55
Once enabled, you will receive automatic notification in your dashboard when an update is available. You can also find the latest version numbers here: (http://theme.co/changelog/) Then you can compare them to what's installed on your site.
If you find anything to be out of date, you can review our update guide.
Hope this helps!