This thread is resolved. Here is a description of the problem and solution.
Problem:
If you're experiencing a 404 error when clicking on the WPML tab in your WordPress dashboard, it might be due to a missing file in the WPML plugin folder.
Solution:
We recommend you follow these steps to resolve the issue:
1. Create a full site backup.
2. Navigate to Plugins -> Add new -> Commercial tab in your WordPress dashboard.
3. Check for updates and update the WPML plugins to the latest version.
4. Double-check if the issue has been resolved.
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. If the problem persists, please open a new support ticket.
This is the technical support forum for WPML - the multilingual WordPress plugin.
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