Fallout 4's biggest mod to date, Fallout London, has finally been released, and with it comes a whole host of new features and locations for players. For the first time ever, players can explore what The Great War did to countries outside of the United States (at least from fans' perspectives; Bethesda is still tight-lipped about it).

While the mod was only released on GOG, it is compatible with both the GOG and Steam versions of Fallout 4. This means that, thanks to players on the mod's Discord server, players can tweak things on their Steam Decks to allow the game to run on there as well. Here's a guide to doing just that on a Steam Deck.

This may seem like a difficult process, but it is easier than it originally looks.

Fallout London Companions-1
Fallout London: All Companions (& How to Recruit Them)

There are 7 available companions in Fallout London, but only 6 are recruitable in a single playthrough. Here's how to find and recruit them!

By 

How To Download Fallout: London On A Steam Deck

First, before players can get started with this process, they will need to make sure that they have the following on their Steam Deck (and the Steam Deck must be in desktop mode):

Fallout London Settlements
All Settlements & Their Locations in Fallout London

Fallout London has 6 Settlements (7 if you count a home). Here's how to find them all.

By 

Once players have all of this done, they can then begin the process of actually downloading the mod. To do so, follow these steps:

  1. Download the game
  2. Put the Steam Deck into desktop mode
  3. Use the Heroic Games Launcher to sign into GOG and "purchase" Fallout: London (the game is free, but it will still say purchase)
  4. Go to Heroic Games Launcher's library and install the mod
  5. Download the downgrader tool and extract it from the ZIP file it is in
  6. Load the tool, log into Steam, and select the location of the game (it is automatically /home/deck/.steam/steam/steamapps/common/Fallout 4/)
  7. Select the option to downgrade the version of the game
  8. Navigate to the folder with the mod and find the installer (the automatic location should be /home/deck/Games/Heroic/Fallout London/)
  9. Right-click on the installer and select the option to add it to Steam
  10. Go to Steam and change the installer's compatibility to Proton 9.0-2 (to do this, just go to the preferences menu for it)
  11. Launch the installer using the Steam shortcut option and navigate to where the game is installed (/home/deck/.steam/steam/steamapps/common/Fallout 4/)
  12. After the installation is finished, close the installer and bring over the game's INI files
    • To do this, go to the /home/deck/Games/Heroic/Fallout London/_Config folder and find the 3 files labeled.INI
    • Transfer those 3 files to the /home/deck/.local/share/Steam/steamapps/compatdata/377160/pfx/drive_c/users/steamuser/My Documents/My Games/Fallout4/ folder
  13. Repeat step 12 but with the files in the AppData folder
    • To do this, go to the /home/deck/Games/Heroic/Fallout London/_AppData folder
    • Transfer all those files to the /home/deck/.local/share/Steam/steamapps/compatdata/377160/pfx/drive_c/users/steamuser/My Documents/My Games/Fallout4/ folder
  14. Move the Fallout4.ini file to the launcher
    • To do this, go to the /home/deck/Games/Heroic/Fallout London/_Config folder and find the file labeled "Fallout4.ini"
    • Transfer that to the /home/deck/.steam/steam/steamapps/common/Fallout 4/ folder
  15. Disable Cloud Saving and play the game!
Rating block community and brand ratings Image
Fallout 4 Tag Page Cover Art
Display card tags widget Display card system widget
Systems
Display card community and brand rating widget Display card open critics widget
Top Critic Avg: 87 /100 Critics Rec: 89%
Display card main info widget
Released
November 10, 2015
ESRB
M FOR MATURE: BLOOD AND GORE, INTENSE VIOLENCE, STRONG LANGUAGE, USE OF DRUGS
Developer(s)
Bethesda
Publisher(s)
Bethesda
Display card main info widget end Display card media widget start
Display card media widget end

WHERE TO PLAY

SUBSCRIPTION
DIGITAL
PHYSICAL
Checkbox: control the expandable behavior of the extra info