[Game] How to install Diablo IV on Steam Deck

On your Steam Deck, go to desktop mode. Click the Steam button, go down to Power, and then Switch to Desktop. Wait for your Deck to reboot.

Next, open up the browser of your choice, go to the Blizzard download page (or just search for it on Google), and download the Windows installer.

Next, we need to add the downloaded .exe file to Steam. Open up desktop Steam, go to Library, and at the bottom left corner, click on the plus sign, then Add a Non-Steam Game.... Navigate to your downloads folder by clicking on Browse, and then go to home/deck/Downloads and add the Battle.net installer file to Steam. Don’t forget to show All Files under File type: if you can’t find the installer.

Now, navigate to the newly added entry in your Steam Library. It should be called something along the lines of Battle.net-Setup.exe. Don’t launch it yet, but instead click on the cog wheel icon, then Properties... and under Compatibility, toggle the Force the use of a specific Steam Play compatibility tool option. During the beta, it was important to choose GE-Proton 7.51 or Proton Experimental. Follow our guide here to learn how to install GE-Proton. But it seems, it now works without pre-selecting a compatibility layer.

Now hit Play to launch the installer, follow the different steps, and wait until it’s done. When the installation process is done, you can remove the Battle.net-Setup.exe from Steam again. Right-click it, go to Manage, then Remove non-Steam game from your library.

Next, we want to add the installed launcher to Steam. In Desktop Steam, go to Library, and at the bottom left corner, click on the plus sign, then Add a Non-Steam Game.... Now we need to look for the file. Click on Browse and navigate to the following folder by going through the folder structure: home/deck/.local/share/Steam/steamapps/compatdata/. Don’t forget to show All Files under File type: if you can’t find the installer.

Here you need to search for the latest added folder under DATE MODIFIED. It should be a 10-character long number. Open it, and go to the following folder: pfx/drive_c/Program Files (x86)/Battle.net. Here select the Battle.net Launcher.exe file. Add this one to Steam. If you can’t see it, be sure you have All Files selected under File type:.

Don’t launch it yet, but instead click on the cog wheel icon, then Properties... and under Compatibility, toggle the Force the use of a specific Steam Play compatibility tool option, like we did in step four.

Phew! We’re finally done. Launch Battle.net now. If you want to customize the artwork, I propose you check out the following guide, but don’t forget to rename the non-Steam game we’ve added.