Yazsoft is out of the business.
Please try the best alternatives for their solutions for free:
Since March 2014 Yazsoft has ended its business and stopped supporting its products. All users of their most popular app Speed Download are recommended to try its powerful alternative - Folx. Folx is a handy download manager and torrent client for Mac. It splits downloads in several threads, resumes interrupted downloads, controls download speed, offers efficient management system for downloaded files and much more!