Good evening Steven and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
I believe the extension in question is missing from the page at the moment.
I have pinged my colleague Geoff about it.
It should not take too long.
But, the good news is that you don’t need to buy anything. This will be a free extension.
I am pretty sure it is based on the following code snippet: https://git.io/vX1fK
You can already use that in the meantime. You simply need to paste the snippet in your theme’s functions.php file.
Best regards,
Geoff B.