Your problem will be that Casio never provided a means for exporting demo songs from the CTK/WK keyboards. They do not output MIDI data to the MIDI OUT port as they play, and they can not be saved as user Songs for export to a computer. So, unless someone made an external audio recording of it, it is just not going to be available anywhere. Your best bet is to find a CTK-450 that is still in working condition and purchase it, or arrange to have its current owner make an audio recording of the demo tune for you.
