@Dr_groove…Thanks for this info. I’ve just had the same problem and managed to find those files in a folder : C:\Windows\System32\DriverStore\FileRepository\synusb64.inf_amd64_neutral_c0225427ebbecd78
I then did the manual update from the device manager and all is OK.
I will see how long it takes for Steinberg Support to answer my Support Ticket for this issue, if ever. 