X Theme Won't Update from 4.6.4

MY licensed version of X-Theme won’t do an auto-uodate. It still says I have version 4.6.4

Installed Version
4.6.4 CHANGELOG
Latest Version Available
5.1.1 CHANGELOG

I’m thinking that’s why when I try to edit a page is says there is no page there? 404 error?

Hi There,

Thanks for writing in! Our auto-update process will not be initiate because you have skipped the update releases in-between. I strongly suggest you to take a full site backup first and then you can manually update your X theme and activate it for automatic updates.

You need to delete your Cornerstone plugin as well and then you can refer to our update guide here (https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62).

Hope that helps.