Extract all the files, with folder names, to the same folder as your WordWeb program files, e.g. '\Program Files\WordWeb'
If this worked correctly, you should then have a folders called, e.g., '\Program Files\WordWeb\WyabdcRealPeopleTTS' containing subfolders called 'a','b',..., 'z'.
Run WordWeb. Click on a pronunciation (NOT the sound icon) to hear it spoken.
You may get an error extracting 'con.wav' - just ignore it, the file is not needed (though note using 7-zip to extract rather than WinRar seems to cause problems). Note the sound files are American English. You must of course have your speaker plugged in an turned on to hear sounds.
To hear sound files click a word root pronunciation in the definitions box, NOT the sound icon the toolbar. Sound files are for root words, the toolbar icon pronounces whatever text is in the lookup box (which may be a derived form).