battle.net app cant download the update for world of warcraft… i cannot lauch the game.
Hi there, Nobo!
So, there’s a few steps to try to resolve this for you, please do make sure to do them in order!
Firstly, please fully close the Blizzard App, and any Blizzard games, and then uninstall the App as per this guide:
Next, please delete all the Blizzard App files, some of which may be left over after uninstallation, by following this guide:
Finally, please download and install the App again via this link:
Once you’ve done that, please try running it again and sign in! You may find it does a number of updates, but that should hopefully fix things. 
Yours,
Arythwinn