This thread is resolved. Here is a description of the problem and solution.
Problem:
The client is unable to add a registration key to the WPML plugin. Despite downloading the plugin from the WPML site and attempting to regenerate the key, the client receives an error message stating that the account has expired.
Solution:
If you're experiencing issues with adding your WPML registration key, we recommend the following steps:
1. Navigate to WP Dashboard Menu >> Updates.
2. Click the "Check again" link.
3. Go to Plugins >> Add New Plugin > Commercial tab and click on the “Refresh account status” button (if available).
If the problem continues, please try these additional steps:
1. Log in to your WPML.org account and visit the Sites page: https://wpml.org/account/sites/
2. Delete the existing site key.
3. Log in to your WordPress site and go to Dashboard >> Plugins >> Add new > Commercial tab and click the Unregister WPML from this site link (if available).
4. Click the Register WPML link.
5. Click the Get a key for this site link to generate a new key.
6. Copy the new key, paste it into the input box, and press the Register button.
For more detailed instructions, please refer to our documentation: https://wpml.org/faq/install-wpml/#register
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