iCal synchronization

Hello.

I try free version and see “iCal Export Addon” in “Add-ons included in this plugin version” in settings.

But its not work((

AND there: https://apphourbooking.dwbooster.com/download in “Version Comparison” i see “iCal Export Add-on” is not included into EREE version.

So what? iCal will work in FREE ver?