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Problem:
You are trying to update the WPML Multilingual CMS plugin from the WordPress dashboard, but the update fails with the error message: 'Update failed: undefined.' Despite the site being registered and the plugin active.
Solution:
If you're experiencing this issue, we recommend you follow these steps:
1. Ensure you take a backup of your site for safety reasons.
2. Navigate to Plugins >> Add New Plugin page, click the Commercial tab, and then click the 'Check for updates' button. If the update doesn’t appear or still fails, you might need to re-register WPML:
a. Login to your WPML.org account and go to the Sites page.
b. Delete the existing site key.
c. Login to your site, go to the Dashboard >> Plugins >> Add new > Commercial tab and click the Unregister WPML from this site link if it exists, then click the Register WPML link.
d. Click the Get a key for this site link, generate the key, copy it, and paste it back into the input box, then press the Register button.
e. Try updating the plugins again.
If these steps do not resolve the issue, our team may need to unblock your site. In this case, delete the existing site key and create a new one following the steps above.

Please note that this solution might be irrelevant if it’s outdated or not applicable to your case. 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.