Hello, I 've tried installing both the Battle.net and World of Warcraft Lutris versions and I get the same error when Battle net is updating the says the the digital signature could not be verified. Also there is no .exe after installation for Battle net.
I am on Clear Linux. 
I installed in the default wine prefix no problems, so I guess that’s where I’m playing it. XD
EDIT: I installed WoW Classic through Battlenet on the default wine prerix but when I press play nothing happens. Is there a fix for this?
FINAL EDIT: OK I managed to make it work, I uninstalled and reinstalled a couple of times and the third time it worked but I had no game files in the prefix Lutris created whatsoever, so I copied both the Battlenet and World of Warcraft folders found in Program Files (x86) of the default wine prefix to the Lutris prefix and it works! I’m so happy!
EXTRA EDIT: The game works but I can’t log in, anyone else having the same problem?