Cannot deregistration through provided webpage

I transferred my website and lost this registration key.
The problem is I couldn't found which Betheme registration key is on this website.
In the normal situation, Betheme tab in wordpress shows its registration key So I can check and deregister through http://api.muffingroup.com/licenses/
However, this doesn't work for the website https://www.labourinc.co.nz/

I bought new registration key for this website but cannot update now.

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