There seems to be a lot of confusion…
The USB Demo Cassette is not an actual cassette tape, it is just designed to look like one. On the top there is a little tab, gently push down on it and slide it over and the USB port will pop out. Plug the port into your computer.
When I plugged it into my computer, it popped up automatically asking me what I wanted to do with the files on it. If it doesn’t do this on your computer, you might have to go to “My Computer” and open up the drive manually. (Opening it will be a bit different on Macs)
It should then work just as any other USB flash drive!