Hi There,
It is recommended to update your site in regular basis to avoid big version jump.
If you relied on HTML, there should not be problems at all.
But if you already tried to upgrade about a year+ ago and had issues, you most likely will face some issues.
This issues can be caused for many reasons, like plugin conflicts for example…
It is recommended to backup your site, perform the update, and fix the possible things that might come up.
As you have a fairly old version, I recommend you to perform a manual update at this time.
You will probably have issues, but not solving them and just avoid keeping your site update is not a good long term solution.
- Revoke your License from X Addons section (check the bottom of the page) and also remove it from your license page on Themeco.
https://community.theme.co/my-licenses/
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Temporary disable any caching plugins and purge all your server cache.
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Delete both X theme (/wp-content/themes/x) and Cornerstone plugin (/wp-content/plugins/cornerstone) by connecting to your FTP (your settings will be saved in the database)
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Download the latest copy of X and upload it to your themes folder via FTP OR you can upload the x.zip via Appearance -> Themes section.
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Latest version of Cornerstone will be installed automatically when you head over X tab of your dashboard. Now you try validating your X theme again and then try to install any other extension and it should function properly.
Let us know how it goes.
Thanks!
If once you have done a back up and updated your site, you face some issues, please let us know so we can guide you to the solution.
Thank you