How to disable recaptcha totally?

-- url of the page with the problem -- : www.nzvirtuemart.co.nz
-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.5.8
-- PHP version -- : 7.0.27
-- Browser(s) name and version -- : All
-- Error-message(debug-mod must be tuned on) -- : Cannot contact recaptcha. ......

In the process or updating a hikashop site from 2.6.4 to the latest version.
Duplicated the site on a different URL - reconfigured the public and private keys for new dev domain. But recaptcha in checkout process will not work correctly. Joomla's contact form works with these keys.

So I want to remove the recaptcha from the checkout process and test checkout process before updating hikashop.
However even thou I have disabled both joomlas and hikashop recaptcha plugins I still get the error message - that cannot contact recaptcha ...
See attached images.

How do I prevent/ disable recaptcha process in checkout before updating hikashop?

Thanks

thanks for the info,
Was able to determine that the core files had been changed and it didn't use the recapthca plugin.

Hope to change this to the default plugin with the update.

Cheers