Have upgraded from 'Free' to 'Pro'; well worth the small outlay...
It would be great (or maybe I've just not found it) if there were a setting to alert (beep) a change in keyboard. This is for users with more than one language installed, where the keyboard layout is changed in Windows by the use of Win+Space (VERY easy to do by accident). Although the language and keyboard settings are easily added to the taskbar, there is no audible warning (this is where you come in!).