Need to deactivate a 'lost' PSE 13 installation

[#1]

Short version as title.  Long version - motherboard bricked and ended up having to rebuild more or less from the ground up, including wiping the hard drives and started over.  As a result, my serial number for Elements 13 has hit its activation limit and I need to deactivate the old install.  Which I can't do because that computer no longer exists.

Advice at https://helpx.adobe.com/download-install/kb/activation-deactivation-help.html#access-previous-comput... is to contact Adobe.  Per the tables at https://helpx.adobe.com/contact/what-contact-options.html, the only contact option listed is "Forums", which I presume is this forum.  So...erm...can anyone help?

[#2]

Go to Adobe.com and click on the blue Contact Us button under the Support menu. That will start a support chat session and they should be able to deactivate your old computer.