I've just come across this thread, great info, and thanks!
I thought I might confirm that I've just successfully installed the app on my A7rII, via my laptop running Windows 10, Chrome browser, with the Sony-supplied USB cable attached to the camera.
Unlike the experience reported by others earlier in the thread, the app downloaded and installed to the camera, seemingly without incident.
Haven't tried it yet, however I can open and configure the app, so I presume it will work. Looking forward to trying it out.
Brian