Rolling back to the 1.10.163.0 version of Fallout 4 is required for Fallout: London to function correctly. This guide explains the process manually if you do not wish to use the automated FO4Downgrader tool.
Pre-requisites for downgrading: Fallout 4, Wasteland Workshop DLC, Automatron DLC
First you need to open the Steam Console via this link, copy the below and paste it into a web browser or run the following in the commandline
steam steam://open/console
Image examples
Then input the following 1 at a time, Steam will notify you once each download is complete, at which point you can move onto the next download:
Image examples
Part A (5332 MB)
download_depot 377160 377161 7497069378349273908
Part B (18022 MB)
download_depot 377160 377163 5819088023757897745
Executable file (48 MB)
download_depot 377160 377162 5847529232406005096
English Language Pack (3243 MB)
download_depot 377160 377164 2178106366609958945
Automatron DLC (365 MB)
download_depot 377160 435870 1691678129192680960
Automatron DLC English Language Pack (109 MB)
download_depot 377160 435871 5106118861901111234
Wasteland Workshop DLC (54 MB)
download_depot 377160 435880 1255562923187931216
Far Harbour DLC (1882 MB)
download_depot 377160 435881 1207717296920736193
Far Harbour DLC English Language Pack (474 MB)
download_depot 377160 435882 8482181819175811242
Contraptions Workshop DLC (190 MB)
download_depot 377160 480630 5527412439359349504
Vault-Tec Workshop DLC (288 MB)
download_depot 377160 480631 6588493486198824788
Vault-Tec Workshop DLC English Language Pack (43 MB)
download_depot 377160 393885 5000262035721758737
Nuka World DLC (2885 MB)
download_depot 377160 490650 4873048792354485093
Nuka World DLC English Language Pack (298 MB)
download_depot 377160 393895 7677765994120765493
HD Texture Pack DLC (56371 MB) (If you have it, remove it)
After download each depot manually you can move the contents of each subfolder in this directory into your Fallout 4 installation folder, ensuring you overwrite all files in the destination folder
Note 1: The location of your ‘steamapps/content’ folder may vary if your Steam install isn’t in the default location or you’re using an Operating System other than Windows Note 2: You can open up your Fallout 4 installation folder easily in Steam by right-clicking on Fallout 4 in your Steam Library and then selecting Manage > Browse Local Files:
Image examples
C:/Program Files (x86)/Steam/steamapps/content/app_377160
If you want to block updates you additionally have set the following file to read only
Note 1: The location of your ‘steamapps/appmanifest_377160.acf’ file may vary if the Steam Library Fallout 4 is installed to isn’t in the default location or you’re using an Operating System other than Windows:
Image examples
C:\Program Files (x86)\Steam\steamapps\appmanifest_377160.acf
After doing all of this you should remove Creation Club content by removing every file inside 'steamapps/common/Fallout 4/Data' with cc in the start
Image examples
