Hi kpax,
am running Vivado 2017.2 with both Arty A7 and Arty Z7 boards ok. I suspect that later Vivado versions are shipping with the Digilent driver support built in. I did not 'add' drivers to make it work.
Have you clicked on 'Open Target' (blue text in your screenshot)? When I do this I get a menu, I then click 'Auto Connect' and my board shows up.
Cheers,
Stephen