Welcome to the forum.
I’m not sure but I’ll ask Mark B when there’s a break in the conference. In the interim:
If you see a green tick you’re registered, Essentially, when you enter your serial code it is checked. If OK, you see the green tick.
So, it sounds like you are registered. I’d try restarting the app. If the demo mode waring still shows, you might need to email tinderbox@eastgate.com. Email, as you might need to share info about serial codes and that’s not something to do on a public forum. 
Hope you are fixed soon.