Hi,
In your license you say it is perfectly OK to use this software for free in personal/non-profit/educational setting, yet you have the floating Smoothboard logo and the continuous pop-up box saying that it is unregistered.
Whilst this is a great program to use, you need to decide whether or not you really want to allow unrestricted use in an educational setting, because at the moment you are not providing that.
Perhaps you could offer free Education licenses to people who provide the address of the schools that it is being used in.
But until you remove the pop-up box and floating add, yit is not going to be an effective tool in a classroom.
Prometheus