Installation and user instructions can be found here: CalendarBOX 3.0 install and user instructions
CalendarBOX works with Claris FileMaker Pro version 16 or later.
CalendarBOX is provided as is free of charge, therefore we do not provide free support for the product. If you need assistance, please note that it will be a paid consultation. To arrange a consultation, please contact us.
CalendarBOX is licensed under a MIT License. Basically, you can do what ever you like with it. There are no restrictions whatsoever.