Hello,
I see that this link below, that should be the correct one for stable virtio drivers:

https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/stable-virtio/virtio-win.iso

points to virtio-win-0.1.171-1 released on May 2019.
The same pointed by the repo
https://fedorapeople.org/groups/virt/virtio-win/virtio-win.repo
Under
https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-virtio/
there are many new ones... Are so they all to be considered unstable?

Thanks,

Gianluca