Lightrom 6.14 - serial number is already in use by the maximum allowed computers

Hi,

I have just installed Lightroom 6.14 standalone after some time of not using it.

It is reporting:

The serial number xxxx is already in use by the maximum allowed computers. You need to deactivate another computer within 30 days to use this product.

(o) Retry activation. I have already deactivate one of my other computers.

( ) Provide a different serial number

I don't have access to the old computer (or perhaps it was discarded old installation on this computer, don't know anymore). I did not know I need to deactivate old installations, so this has caught me off guard now.

This page

https://helpx.adobe.com/x-productkb/policy-pricing/error-activation-limit-reached-sign.html

says have your serial ready (I do) and contact us.

But there's no way how to reach support nowadays! I have spent 20 minutes looking for a way how to reach out to support. Even this:

https://helpx.adobe.com/contact/what-contact-options.html

confirms there's no way for me to reach support.

This brings some serious level of frustration - it was purchased as perpetual license and now some new articial limitations are imposed on it.