This thread is resolved. Here is a description of the problem and solution.
Problem:
You recently changed your website domain from https://usabox.com to https://www.usabox.com and encountered an error in the WPML Installer log indicating 'wpml: Unable to register: Site key not matching'.
Solution:
If you're experiencing this issue, we recommend you follow these steps:
1. Navigate to Plugins → Add New and select the Commercial tab. Then, click 'Unregister WPML from this site'.
2. After the page loads, click on 'Register WPML'. You will see a prompt to enter the site key. Click on 'Get a key for this site'.
3. In your WPML account, complete the site key wizard and set it to 'Production site'.
4. Copy your new key and paste it in the Commercial tab. Afterwards, you can delete your old site key in your WPML account.
This solution might be irrelevant if it's outdated or not applicable to your case.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 issue persists, please open a new support ticket at WPML support forum.
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Last updated by 1 month, 2 weeks ago.
Assisted by: Andrey.