For update 3.8.x, please read our blog https://agethemes.com/things-to-do-before-upgrading-joomla-3-8/
Blog mention about your problem and how to solve it.
Get an access to all 211 items designed and developed by Age Themes team plus all the future items
which will be released over the course of your club subscription.
Price starting from $51.75
Thanks for your info.
For update 3.8.x, please read our blog https://agethemes.com/things-to-do-before-upgrading-joomla-3-8/
Blog mention about your problem and how to solve it.