Based on the information found on the official website, it appears that the software is somehow bundled with their products meaning that you will receive the installation package after you buy one of their devices.
To get an overview of their products, kindly visit the following website: https://showplay.com/store/index.htm
I can't find on their website if the software is sold separately, but you can contact them to see that: https://www.showplay.com/about.htm
