The program doesn't work on Windows 8.1 because it has been discontinued. I checked the official website, and it now leads to a page specifically placed when the domain expired. This means the website/business was discontinued as well. That could be the cause to your issue. However, if you have the software installed, right-click it and choose Properties > Compatibility. Select a previous version from the list and launch the software. It should work this way, or it will give you additional errors.