Same here, but also without lost internet. Installation just hangs at 100% but does not complete but can't be cancelled either. I get the menubar item but it won't work since the application isn't fully installed. Force quit and try again is a no go either. Oh well, I did not have this toolbox before, so I guess it isn't so important...
Update: tried quitting everything, restart computer, install toolbox again, it downloads up to 100% and then just sits there.
OS X 10.11.6. iMac 3,2GHz i5, 24 GB RAM
Last edited: Aug 19, 2016