On the bottom of the U7 MK II, there is a small switch for USB mode. It is switched to USB 1.0 by default for plug & play, if you change it to USB 2.0 the driver will install properly.
I have tried it with both settings, neither will make the driver install, same error message.
Only difference is that if I have it on usb1, it gets recognized automatically as simply "usb audio device", and if I have it on usb2, windows 10 recognizes it as "Xonar U7" automatically.
Still won't let me install the drivers either way 😞
Like I said in my original comment, I have tested it on 2 PCs with the same result, and I have downloaded and redownloaded the file many times from the asus website, I have even tried downloading the driver for windows 8 and 7 and installing it in compatibility mode (after trying repeatedly with the win10 drivers of course), none actually worked.
Is there a device ID somewhere on the unit I can paste here for you to check or something?
I see what the problem is, you do not have a Xonar U7 MK II. It would be indicated as such under device manager.
Even though it's hard to tell them apart, you have a Xonar U7 and it's necessary to download the correct driver here:
The box says U7 MK2, and it was a sealed box from amazon, unless you are selling U7-s from the factory as mk2-s I can't see how that can happen, but that's why asked where I can find some sort of device ID on it so you can check
That does sound bizarre, please private message me your serial number and a copy of the invoice. Thanks.