After some checking, I've found that XSitePro is a commercial application that is available for downloading only after you've purchased it from its official website. There is a Demo page on the official website, but that's actually a demo video where you can see how the program works. There's no way to download it.
To buy the application, visit the following page: http://www.xsitepro.com/buy.html
Additionally, if you need just the executable file, contact the developers: http://www.xsitepro.com/contact.html