MG10XU usb controler doesn´t work needs digital signature

Who can help me please. Need help to find the usb controller with digital signature to make the yamaha MG10XU work or how to disable the digital signature.
Recently i buyed a new yamaha mg10xu , i entered the oficial sites of yamaha and steinberg recomended in the user manual and downloaded the usb controller for windows 7 -64 but it doesn´t work. how can i get the digital signature for this usb controller?

hi is there any update on your device?