Hi There @selfhelpafrica
You're running older version of X theme with another older version of Cornerstone plugin, so that our automatic updates will not work on your system.
The latest version of X theme is (v6.4.6) and Cornerstone plugin is (v3.4.6) as you can see here on our version information (https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195). I would suggest you to manually install X theme and Cornerstone plugin to make it compatible and then you should be able to validate your site to activate automatic updates as well (https://theme.co/apex/forum/t/setup-product-validation/55).
You can simply download the latest version of X theme from your Envato account, then delete your current X theme and Cornerstone plugin and then you can re-install it. All the current settings and your data will be saved in the database, so it's safer to delete your theme.
Please note: Since you're currently running an older version, I would suggest you to take a full backup of your site before updating.