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Problem:
The client encountered an issue when upgrading from WPML version 4.6.3 to 4.6.8. Specifically.

Solution:
We recommend the following steps:

1. Ensure you have a backup of your site or perform these steps on a staging site. Also, enable the

   debug.log

   :
   Debugging WPML documentation.

2. Disable all plugins and switch to a default theme like TwentyTwentyFour.
3. If you have caching enabled via plugins, flush the cache then disable the plugin.
4. If server caching is enabled, flush it or turn it off temporarily.
5. Enable only WPML, starting with version 4.6.3, and update progressively to 4.6.5, then 4.6.7, and finally to 4.6.8, which can be downloaded here: WPML 4.6.8 Changelog.
6. Delete all WPML add-ons and reinstall the latest versions from the Plugins > Add New > Commercial tab, or download them from WPML Downloads and upload them using the standard WordPress uploader.
7. Re-enable the theme.
8. Re-enable plugins in small batches to check for errors.