Minecraft Dungeons not working

Hei

I installed a new version of Minecraft Launcher yesterday. And i was able to laucnh Minecraft Dungeons from the Launcher.

But today, it's not working anymore. Instead of running Dungeons, the Launcher wants me to "repair it". When i click on "repair", then it fails " Can not install the game" ( i do not know the exact error message because i have it in french " Echec de l'installation du jeu")

 

So i just uninstalled Dungeons and try to reinstall it.. but nothing is working. I have the message in the Launcher that i need to update Dungeons.. but it fails

Hope you can help