I don't think it's possible to buy CASMATE Proe. I've checked various websites and forums, and the software was released a long time ago, back when Windows 98 was popular. In no way will it work with Windows 10 if you've had the setup package. There is also no place to buy the application, since the official website is discontinued.
However, Flexi Sign is still available. You can use their official website to obtain additional information: http://www.thinksai.com/BREnglish/