Before downloading a single file, you must prepare your base game. Fallout: London completely replaces the assets of Fallout 4 , meaning a dirty installation folder will cause immediate crashes.

as an administrator. Choose the installation path to your Fallout 4 directory. Important Post-Installation Steps (f4se)

Go to Documents\My Games\Fallout 4\ and delete Fallout4.ini and Fallout4Prefs.ini . Re-run the Fallout London launcher to regenerate clean, mod-compatible configuration files. "Incompatible Version" Pop-up