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GOG, also known as Good Old Games, is a video game platform similar to the Steam Store and has an extensive library of classic games. Unsurprisingly, it isn’t natively available on the Steam Deck, but with Decky Loader, you may run the GOG Galaxy launcher in the Steam Deck’s Gaming Mode and install your favorite GOG titles.
The Decky Loader program has a Testing store that allows users to install the NonSteamLauncher and run unofficial gaming platforms like GOG. Here’s how to install the Decky Loader andrun GOG Galaxy games on the Steam Deck.
Updated June 01, 2025, by Michael Llewellyn:The Decky Loader program now requires a sudo password in order for it to be installed. This works as an admin password to ensure you don’t install any harmful programs on your Steam Deck. As such, this guide has been updated to outline the steps that must be followed when creating a sudo password for Decky Loader and other useful third-party apps.
How To Install The Decky Loader On The Steam Deck
The Decky Loader program allows users to customize the functionality of the Steam Deck. This includes installing the NonSteamLaunchers app to run gaming stores like GOG and install yourfavorite classic and modern titles. The following steps can be used to install Decky Loader and its Testing store:
Google Chrome is required to run the NonSteamLaunchers through the Decky Loader.
How To Access The Testing Store
How To Fix Missing NonSteamLaunchers From Decky Store
There may be a dispute preventing the NonSteamLauncher from appearing on the Decky Store. Unfortunately, this means that it’s no longer installable from the Decky Loader. In the meantime, and if the above steps don’t work, use the following steps to fix NonSteamLauncher via desktop:
Only use these steps after installing Decky Loader.
How To Install GOG Galaxy On The Steam Deck
With NonSteamLaunchers installed via Decky Loader, you can now install and run the GOG launcher and install your purchased games. The following steps can be used to add GOG tothe Steam Deck’s library:
There is a bug preventing some GOG users from signing in with the Steam Deck in Gaming Mode. Signing in to GOG using Google Chrome in Desktop Mode should resolve the issue. If that doesn’t work, try resetting your password using the “Forgot My Password” prompt.
How To Fix Decky Loader After The Steam Deck Update
Some of the most important updates for the Steam Deck may interfere with third-party programs like Decky Loader. Here are the steps that must be followed to restore your Decky Loader program, its settings, and your plugins (this will also work for any future issues that may arise from updates):
Choose a memorable sudo password, as changing it requires resetting the Steam Deck to factory settings.
