First, if you have Mozilla Firefox, download "video download helper" : https://addons.mozilla.org/fr/firefox/a ... oadhelper/
Then, launch a match, click on the icon "video download helper" and save the video where you want.
After that, convert your video in mp3 with "free avi video converter" : https://free-avi-video-converter.fr.softonic.com/
and convert this mp3 in wav format with "Audacity".
If you have some others questions, don't hesitate