MidiYodi is distributed as shareware allowing it to be installed and evaluated with some minor limitations such as saving MIDI-files. In order to gain full access a license has to be purchased at $17.95. Once a license has been purchased you will revieve an e-mail containing your license key. (This could take a couple of hours.)When the key has been obtained please, start MidiYodi, open the Preference dialog, enter the key and press OK. MidiYodi use PayPal as payment provider. Any problems with payments or recieving the license key, please refer to PayPal support.