I’ve looked around a little, and found some mentions of using Lutris, or running it through Steam (tbh I don’t know how that would work), but I’m not really able to find any guide that explains the process well enough. I’m so used to the game being handled by Blizzard’s Battle.net launcher, so I can’t really wrap my head around how that would work.
Use Steam.
Download Battle.net Launcher.
Add it as non steam game.
Run it and install like normal.
Do not sign in. Close it.
In a terminal, type this: find ~ -name Battle.net
Look for a line like: /home/you/.local/share/Steam/steamapps/compdata/#############/pfx/drive_c/…
Those ###s are Battle.net’s steam ID on your system.
Back on Steam, right-click Battle.net and click Properties.
Change the Target line to: “/home/you/.steam/steam/steamapps/compdata/~your numbers~/pfx/drive_c/Program Files (x86)/Battle.net/Battle.net Launcher.exe”
Set Compatibility to Proton 10 beta.
Now launch Battle.net and install WoW.