This thread is resolved. Here is a description of the problem and solution.
Problem:
The client is unable to update WPML because the plugin cannot connect to wpml.org for registration verification. This issue arises from network or security settings blocking communication with wpml.org.
Solution:
If you're experiencing this issue, we recommend you follow these steps after a full site backup (mandatory):
1. Go to your account page at https://wpml.org/account/sites/
2. Delete the existing key for the site.
3. Navigate to Plugins>>Add New>>Commercial tab.
4. Click on "Unregister WPML from this site".
5. Refresh the page.
6. Click on "Get a key for this site".
7. Copy the newly generated code.
8. Return to Plugins>>Add New>>Commercial tab.
9. Register the site with the new key.
For more detailed instructions, please refer to our documentation: https://wpml.org/faq/wpml-plugin-cannot-connect-to-wpml-org/
Additionally, consider checking related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins.
If this solution does not resolve your issue or seems irrelevant, we highly recommend opening a new support ticket at WPML support forum.
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.