You shouldn't show your registration code to the public.

This is the first time I see a request like that. Usually weird behavior can be explained by other software installed on your computer. Try to use a demo version of Replay Media Catcher on any other computer and I'm pretty sure you won't see anything like that.

I have no idea what causes the problem. You may try to close other programs and even kill other processes on your computer and try to find the one that makes it happen. But it is pretty weird that the program disappears without any error messages.

You can also try to install Media Catcher onto clean OS and see whether the situation is the same.

p.s. If you don't want to spend your time onto something like this, you can always use a 30-day unconditional money-back guarantee that Applian Technologies offers.