Hi Michael,
Thanks for writing to us.
Please check whether any version of Cornerstone is already there inplugin list, try to re-install it after deleting it.
Also you might have a third party conflict with Cornerstone which causes the error.
I would suggest you to deactivate all of your third party plugins and then try installing Cornerstone again.
Also, make sure the minimum requirements to run X and Cornerstone meet here: https://theme.co/docs/version-compatibility
Please send the screenshot after translating the errors, it will help us to understand the issue you are having.
If you still find that issue exists, please provide login credentials for your site in a secure note, including:
– WordPress Site URL
– WordPress Admin username / password
To create a secure note, click the key icon underneath any of your posts.
Thanks