@TomLabar I finally made it worked. But honestly, I did some many different steps that I am not sure which are relevant.
By clicking very quickly before it crashed, I activated the beta version (click quickly to the gear icon then "parameters", "advanced" in the menu and activate the "Beta"). That way, I switched to the version 1.2.4 Beta. But I saw no improvement (the progam still crashed).
After that, I downloaded and installed separately the Business Streaming: https://business.vive.com/fr/solutions/streaming/
This one did not crash when I ran it. I plugged my headset to my PC with an USB cable and I installed the latest version of the app (v1.0.17.3) in the heaset (go to the parameters and go to the section "about" to see the button to install). Honestly, the installation failed several times and I don't know why (my headset is up to date by the way). But the third or fourth try succeded. Hurray!!!!!
After several tests, It seems now that when I run the Vive Business Streaming, then stop it then start the Vive Streaming Hub, it works.
Hope it could help...