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Steam Deck/Fixes/GOG.com

From PCGamingWiki, the wiki about fixing PC games

GOG Galaxy, the Windows client for GOG.com does not support Linux.

Install GOG.com games through Heroic[1]
  1. Press Steam and then Power, then select Switch to Desktop.
  2. Open Discover.
  3. Search for and install Heroic Games Launcher
  4. Open Heroic and login to GOG.com account.
  5. Install games.
  6. Enable Minimize Heroic After Game Launch in Settings.
  7. Click Return to Gaming Mode, click Games and Add the installer as a non-Steam game.
  8. Heroic can launched from SteamOS in the Non-Steam tab.
Heroic Games Launcher is an open-source, native GOG and Epic Games Launcher that supports Linux, Windows and macOS.
Install GOG.com games through Steam manually
  1. Press Steam and then Power, then select Switch to Desktop.
  2. Open Firefox or any browser.
  3. Visit GOG.com
  4. Log in to GOG.com account and download games backup installers manually.
  5. Navigate to /home/deck/Downloads/.
  6. Change File type to All Files and select the game installer, and Add to programs.
  7. In the Library, right click on the installer and click Properties.
  8. In Compatibility check Force the use of a specific Steam Play compatibility tool and check latest Proton version.
  9. Launch the game from Steam in the Non-Steam tab.
  1. ↑ Epic Games on a Steam Deck gets WAY easier with Heroic Flatpak - YouTube - last accessed on 2022-03-11