Battle.net

The Battle.net Launcher can be installed and launched via wine, which works pretty well. To play most of its games a recent wine-staging version is recommended.

Setup

Tested on nixos-unstable with wine-staging 5.22 and found to be working with World of Warcraft 9.0.2:

 users.users.youruser.packages = with pkgs; [
   (wineWowPackages.full.override {
     wineRelease = "staging";
     mingwSupport = true;
   })
   winetricks
 ];

Create a 64-bit wine prefix and enable DXVK support.

 export WINEARCH=win64
 export WINEPREFIX=$HOME/.wine-battlenet
 winetricks dxvk

Download the Battle.net-Setup.exe from https://www.blizzard.com/apps/battle.net/desktop and install it by executing

 wine64 Battle.net-Setup.exe

Follow the installation and upon completion login in with your Battle.net Id or create one.

The Launcher should now start up and allow you to install and launch games.

Updating NixOS and the Battle.net Client

After updating any wine related packages the Battle.net client may throw an error on launch.

Re-run the `wine64 Battle.net-Setup.exe` inside the previous wine prefix you used to update the application and avoid this error.

Steam

Alternatively, you can install Steam and then add the Battle.net installer there via "Add Game -> Add a Non-Steam Game...". You must also go to the Properties of the added game in Steam and set Compatibility to GE-Proton8-25 (or later version).

If you get stuck on the login screen where there are no login buttons, you must launch the Steam app with "WINE_SIMULATE_WRITECOPY=1" env variable. This might be just a temporary glitch. You can also add Battle.net client or even the game directly to Steam. Look for installed binaries (.exe) in "~/.local/share/Steam/steamapps/compatdata/".