Hi Prasant, Thanks, I have many other sites installed with x-themes on the same server. No problems with these other sites concerning activation. Only with this particular website.
Update: when I paste the purchase code and hit enter, I see the URL appearing in the "manage your licenses" pages at theme.co. So the connection from my website to the theme.co site works. But the message keeps teling me "We could not check if this license was valid"