Demo text will not go away

So. I am kind of frustrated at the moment. I’ve been using the demo version of iStopMotion for 5 days, making a 30 seconds animation for a school assignment. I was told that when purchasing the license the demo text would go away. The license is now installed, but the text is still there for the images created with the demo.
PLEASE. PLEASE tell me that there is a way to get the text removed?

I am pretty sorry to tell you that the text is burned into the image and this won’t go away once you installed a license key. Please can you tell me were did you get this information from, so we can investigate and change it?