Hello,
Apple recently changed their policy about third-party apps and programs. ETC needs to work with Apple to get the SmartSoft app registered for OSX El Capitan.
In the meantime there is a workaround:
Go to Launch Pad > System Preferences > Security & Privacy
Bottom left : click padlock to unlock
And toggle "allow apps downloaded from" to "Anywhere"
(This will allow and app to run and would make your MAC unsafe by Apple standards :) )