If I'm not mistaken, you are referring to this:
The guide mentions that you must press that button to download the virtio ISO. That button is a direct download of that ISO. And that ISO includes everything you need if I'm not mistaken, or am I missing something else?
The guide mentions downloading the ISO and using it to install the virtio driver during OS installation, but it doesn't mention running the Install Wizard from the ISO after OS install to get the rest of the drivers installed, nor does it mention the qemu guest agent. Not sure if those steps are necessary, but those are the steps that I think the above poster was referring to.
