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Problem:
After upgrading the WPML plugin to version 4.6.15, the client's site experienced a critical error upon login, which was resolved by deactivating the plugin. The error was a TypeError in the WPML_Dependencies class, indicating an issue with handling expected versions of dependencies.
Solution:
The client managed to restore the site functionality after testing and reinstalling some WPML plugins and disabling others to prevent further crashes.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking the related known issues, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should you need further assistance, please do not hesitate to open a new support ticket.