Hey there,
Firstly, apologies for the long delay in responding. It looks like there was a mix up with the last couple of posts, so it appeared as though we were waiting on further information from you.
I took a look at your site and although you had Pro installed, you had an X child theme activated. So when you tried to add in the Pro licence, it was attempting to register X still, not Pro, and therefore did not work. I’ve added the Pro child theme for you, activated it and added in your product licence and now it’s all working.
So your product activation issues should now be sorted. If you still have problems, let us know, otherwise have a great day!