This was my experience a few hours ago: I am giving this 2 stars because it used to be a great app. However since FF57 there have been nothing but problems. This morning I was told to load the latest Companion App (version 1.0.8) which I did, and now nothing works. It either flashes the Save-As screen and disappears, or it brings up the top part of the Download the Companion App screen again but does not display the rest of it and goes no further.

Since then, I have deleted VDH and its Companion App, rebooted my machine (Windows 64bit) and re-installed both. Even though the version numbers and file sizes are the same as before, now it is working about 60% of the time. I often have to try it several times, and use the options that appear to the right of the simple download. So perhaps back up to 3 stars.