CalendarBOX works with FileMaker Pro 13 or greater. If you would like to edit the Custom Functions within CalendarBOX, you will need FileMaker Pro Advanced, otherwise FileMaker Pro will suffice.
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.