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Problem:
During the final step of the WPML onboarding wizard, the client encounters a critical error displaying an 'Internal Server Error' message. The wizard cannot be rerun or reverted to previous steps, and reinstalling WPML does not resolve the issue.

Solution:
1. Ensure to create a full backup of your site or set up a staging environment.
2. Update any outdated plugins or themes to their latest versions.
3. Clear all types of cache on your site.
4. Deactivate all plugins, including WPML, and switch to a default WordPress theme like Twenty Twenty.
5. Enable WordPress debug mode by following this guide: https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/
6. Reactivate the WPML plugins and attempt to run the setup wizard again.
7. If the problem persists, check for fatal errors in the debug.log file within the wp-content folder.
8. If the error is resolved, reactivate your theme and other plugins one by one to identify the problematic component.

If these steps do not resolve your issue or if the solution seems outdated, we recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. Should the problem persist, please do not hesitate to open a new support ticket with us for further assistance.