I tried to test it, but guess what.
Sony, in the process of firmware upgrades, ditched the liveview support for the a7r in Capture One completely. It was available in earlier versions. Unfortunately I upgraded the camera´s firmware and there is no way back.
a7, a7-s, a7 II seem to work according to info on the web, but the a7r, where it makes the most sense in a studio surrounding is left out.
I really don´t know what´s going on in those companies?!
If anyone is interested, I am ready to sell my A7r, with Hama/Spiratone Tilt-Shift bellows and Rodenstock Apo-Rodagon 2.8/50mm and Apo Rodagon N 4/80mm
Cheers,
Oliver