HI @jwalt1,
Thanks for reaching out.
I suggest that you disable your cornerstone plugin first so that you won’t have any problem when updating your X theme via automatic updates and once the X theme is successfully updated to the latest version, you can now install the latest cornerstone plugin again. If it doesn’t help, you can manually update your theme.
Here are the steps on how to update your theme manually:
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Delete the Cornerstone plugin to avoid any conflict
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Go to the theme page and activate another theme in order for you to delete the current X theme installed on your website.
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After activating another theme example(twentyone theme) then delete the X theme
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Then go to your themeco account page and you can download the latest version of the X theme

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After downloading the latest version of X theme then upload it to your website and activate it
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Lastly install the cornerstone plugin that is compatible with your latest version of X theme
Hope that helps.
Thank you.