These instructions are for running the game from the Linux Steam client using Steam Play. Running the game with your own Wine installation should be considered unsupported.

In Steam, go to View → Settings → Steam Play and Enable Steam Play for all titles, if you haven’t already.
Note what Proton version you’re using. We have only tested with Proton 3.16-6 Beta (the default and most recent version at the time of writing).
Install CHAOS;CHILD.
Download the patch.
Unzip the archive somewhere, not in your game directory.
Browse to the newly extracted CCPatch-v<version>-Setup folder.
DO NOT simply run CCPatch-Installer.exe with Wine.

Instead, open a shell and use the following command:
```
STEAM_COMPAT_DATA_PATH=~/.local/share/Steam/steamapps/compatdata/970570 ~/.local/share/Steam/steamapps/common/Proton\ 3.16\ Beta/proton run CCPatch-Installer.exe
```
IMPORTANT: If the Steam library you installed CHAOS;CHILD into is somewhere else, replace both occurrences of ~/.local/share/Steam accordingly. If you’re not using Proton 3.16-6 Beta, replace that too (check your steamapps/common to find the right folder).
Follow the instructions.

Playing

Clicking Play in Steam should now run the patch launcher. Make sure you’ve clicked Finish in the installer before trying to start the launcher.

Known issues

Kanji in karaoke subtitles are rendered as boxes.
Leaving the installer running too long may crash it (this has been reported fixed, if you encounter this please let us know)

Troubleshooting

After clicking Play, Steam installs DirectX, then the launcher starts. After clicking Start Game, the game starts unpatched.

You ran the installer with a different Wine/Proton version than the one you configured Steam to use for CHAOS;CHILD. Rerun the installer with the version you want to use, and make sure Steam is set up to use it for launching the game.

Uninstalling

To uninstall, browse to the game directory (e.g. ~/.local/share/Steam/steamapps/common/CHAOS;CHILD), open a shell and run:

STEAM_COMPAT_DATA_PATH=~/.local/share/Steam/steamapps/compatdata/970570 ~/.local/share/Steam/steamapps/common/Proton\ 3.16\ Beta/proton run nguninstall.exe

Note this will leave your game unable to start, as Steam Play currently has an issue with the game’s boot.bat script which we work around by replacing it with a symlink to the patch launcher, LauncherC0.exe. After you uninstall the patch, that program will be gone, so you’ll need to replace boot.bat with either a symlink to or a copy of the game’s official launcher, launcher.exe, to make it work again.

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