I can’t activate the installer dmg file on my iPad Air
I have paid for the upgrade.
If your M-Audio Keystation suddenly stops working in Dorico for iPad, the cause is usually an interrupted USB connection, the MIDI input device being inactive in the app settings, or a failure to restart the app after an update.
Check the USB adapter and cable. Whenever possible, use genuine Apple adapters (such as the Camera Adapter to USB). Ensure the Keystation is receiving sufficient power (some iPads provide insufficient bus power, making an active USB hub or a separate power supply necessary). You must also follow the correct sequence: connect the keyboard to the iPad before launching Dorico for iPad.
Open the app settings in Dorico (select the application menu/gear icon and go to the “Play” tab). Scroll down to the “MIDI Input Devices” section. Check whether the Keystation is listed there and ensure the checkbox is ticked or the device is activated. Sometimes, an update or system change resets this option.
Ok, I’ll ask…what does this have to do with Wavelab? 
Thanks so much Alfo. I checked the play settings. I checked the m-audio key station was listed , which it was. Then I launched Dorico 6 and the key station worked fine for note Input.
In case you are Italian : GRAZIE MOLTO.
Warrick