I've reinstalled the software and I'm not able to access to WebGUI from three different machines in tha same subnet from which in the beginning I could access (before this problem occured). I tried from other machine in the same range from which I never tried to access and It works. I can access to WebGUI. I don't understand it!!!
That specific one wouldn't work because the version for open source projects uses the GPL license (version 3, but which version is irrelevant). Sure, we could distribute it that way, but it would effectively make pfSense GPL-licensed rather than BSD-licensed. Not going to happen.