[Resolved] Can't unregister to register again

Problem:
The client was unable to update or reinstall WPML after deleting it due to an unresponsive 'Unregister WPML from this site' button, following a URL change and database update on a multisite. Additionally, the client needed to activate a new WPML license purchased under a different account.
Solution:
We recommended the following steps to resolve the issue:
1. Deactivate all plugins to prevent any interference.
2. Install the Adminer plugin to access and modify the server database directly.
3. Delete the old site key from the server database to remove any conflicts with the new license.
We asked the client to confirm that they have a backup before proceeding with these steps. After these adjustments, the client should attempt to register the new site key.

If this solution does not resolve your issue, or if it seems outdated or irrelevant to your specific case, we highly recommend opening a new support ticket. Additionally, please check the related known issues, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. For further assistance, you can also visit our support forum.