AX1800: Windows cannot load drivers

So I just installed a PCE-AX1800. It is recognized as "MediaTek Bluetooth Adapter". I downloaded the wifi and BT drivers from the Asus website. I installed the BT driver to this device.

However, Windows refuses to load the driver and the card isn't working. I've seen others with the exact same problem but no solution. And yes, I have tried restarting Windows and reinstalling the driver.

What do?

EDIT: Forgot to mention that this is for Windows 10 PC. It should be able to handle the AX1800 card/WiFi 6 (though only using this for BT).