There is nowhere specified about the compatible version of Windows where FireCapture can be installed. I have downloaded version 2.4 from the official website and installed it normally without errors. I have also installed Java Runtime from its website. Secondly, when I have started the installation procedure in Windows 8.1, I have also selected Run as Administrator from right click.
Download the latest version and follow the instructions: http://www.firecapture.de/#download