What is the nature of the link above http://www.digitalfossils.com/Download/NVil-Apr-23-15.rar

a free version, a demo version, a pro version ?
Who can use it ? a customer of Nvil, a register member, a simple visitor?

Some infos of the new toy Zmodeler ;) (scroll the page)
http://pixologic.com/zclassroom/homeroom/lesson/zmodeler/