During our live session, we were unable to get the ED launcher to verify the installation files. I finally got it to do this (took a really long time, maybe 10 minutes or so).
Afterwards, ISE crashes when ED:Horizons starts.
The hud log contains the following
2016-02-24 21:54:40,798 [WinEventWatcher] DEBUG Tobii.EyeX.Interaction.Core.Processes.ProcessInfoFactory - Can not access process: 10332, error: System.ComponentModel.Win32Exception (0x80004005): Access is denied