Fallout London Installation Guide: Downgrading Fallout 4 on Steam

For users who own Fallout 4 on Steam and wish to experience the expansive world of Fallout London, a necessary step involves rolling back your Fallout 4 installation to version 1.10.163.0. While this process might seem intricate, especially for the Game of the Year Edition, this guide provides a comprehensive, step-by-step walkthrough to ensure a smooth downgrade, preparing your game for the exciting Fallout London mod.

Step-by-Step Guide to Downgrade Fallout 4

To revert your Fallout 4 to the required version, you will be utilizing the Steam console. Follow these instructions meticulously to correctly downgrade your game:

1. Open the Steam Console: Begin by opening your web browser and typing steam://open/console into the address bar. Press enter. This command prompts the Steam client to launch the console, which is essential for downloading specific game depots.

2. Download Previous Version Parts: In the Steam console, you will need to download specific parts of the Fallout 4 version 1.10.163.0. Enter the following commands one by one, and wait for each download to complete before proceeding to the next. These commands instruct Steam to download specific depots (game data packages) required for the downgrade:

   • For Part A, use the command:
     download_depot 377160 377161 7497069378349273908

   • For Part B, use the command:
     download_depot 377160 377163 5819088023757897745

   • For the main executable file, use:
     download_depot 377160 377162 5847529232406005096

   • For the English language version, use:
     download_depot 377160 377164 2178106366609958945

3. Download DLC Content (If Applicable): If you own any Fallout 4 DLCs, which is necessary to ensure compatibility with Fallout London, you need to download the corresponding depots for each DLC. Use the following commands for each DLC you own and their English language packs:

   • For Automatron:
     download_depot 377160 435870 1691678129192680960
   • For Automatron English language pack:
     download_depot 377160 435871 5106118861901111234
   • For Wasteland Workshop:
     download_depot 377160 435880 1255562923187931216
   • For Far Harbor:
     download_depot 377160 435881 1207717296920736193
   • For Far Harbor English language pack:
     download_depot 377160 435882 8482181819175811242
   • For Contraptions Workshop:
     download_depot 377160 480630 5527412439359349504
   • For Vault-Tec Workshop:
     download_depot 377160 480631 6588493486198824788
   • For Vault-Tec Workshop English language pack:
     download_depot 377160 393885 5000262035721758737
   • For Nuka World:
     download_depot 377160 490650 4873048792354485093
   • For Nuka World English language pack:
     download_depot 377160 393895 7677765994120765493

   These downloaded files will be located in your Steam library folder, typically found at C:Program Files (x86)Steamsteamappscontentapp_377160. Each depot will be in a separate folder named “depot_[depot number]”, for example, the executable will be in “depot_377162”.

4. Construct the Downgraded Version: Create a new folder on your desktop named something descriptive like “Fallout 4 Downgrade Files”. Copy the contents from each of the downloaded depot folders into this new folder. If there are file conflicts, choose to replace the files to ensure you have the correct versions. This step essentially reconstructs the complete 1.10.163.0 version of Fallout 4.

5. Replace Current Installation Files: Navigate to your current Fallout 4: GOTY Edition installation folder. This is usually located in C:Program Files (x86)SteamsteamappscommonFallout 4 Game of the Year Edition. Delete all files and folders within this directory. Then, copy the entire contents of the “Fallout 4 Downgrade Files” folder you created in the previous step into this now-empty Fallout 4 installation folder.

6. Set App Manifest File to Read-Only: Locate the Steam app manifest file for Fallout 4. This file is named appmanifest_377160.acf and is typically found in your Steam apps folder at C:Program Files (x86)Steamsteamapps. Right-click on appmanifest_377160.acf, select “Properties”, and in the “General” tab, tick the “Read-only” checkbox. Click “OK”.

   Alt text: Screenshot showing the properties window of the appmanifest_377160.acf file, with the Read-only checkbox ticked to prevent automatic updates from Steam, ensuring the downgraded Fallout 4 version for Fallout London remains stable.

   Setting the app manifest file to read-only prevents Steam from automatically updating your game, which is crucial for maintaining the downgraded version required for Fallout London. This ensures that Steam will not inadvertently revert your game to a newer, incompatible version unless you manually initiate an update.

Conclusion

By following these steps, you have successfully downgraded your Fallout 4: Game of the Year Edition to version 1.10.163.0. This downgraded version is essential for ensuring compatibility with Fallout London, allowing you to properly install and enjoy the mod. Remember to launch Fallout 4 directly from the game executable within your installation folder to bypass Steam’s update checks and maintain your downgraded version. You are now set to proceed with the Fallout London installation process and immerse yourself in this highly anticipated mod.