Hello There,
If you do not have have a caching plugin or CloudFlare, you can skip that step. Anyway, please be advised that we have released X 6.0.4 and Cornerstone 3.0.4. It is now available in automatic updates. You can now update to this latest version. This latest release contains fixes for several issues so be sure to check out the changelog (http://theme.co/changelog/).
And if ever you still want to revert to a stable X version, you can download the previous stable release from your dashboard (https://theme.co/apex/dashboard). You can find the link below the download button of the latest version.
https://image.prntscr.com/image/tJBqlWFrR9Grxb7_NL1XIA.png
The image above may not look like what you have in your dashboard. It depends on the licenses of the product that you may have registered. In your dashboard, you may only have X.
Hope this helps. Please let us know how it goes.