How to Start Fallout 4 Script Extender (F4SE) from Mod Organizer 2 (MO2)

If you’re using Fallout 4 Script Extender (F4SE) with Mod Organizer 2 (MO2), follow these steps to ensure it launches correctly.

1. Install F4SE Properly

✔ Download the latest F4SE from the official site: F4SE Official Site
✔ Extract the files into your Fallout 4 root directory (where Fallout4.exe is located):

C:\Program Files (x86)\Steam\steamapps\common\Fallout 4\

✔ Move the following files into the Fallout 4 main folder:

• f4se_loader.exe
• f4se_steam_loader.dll
• f4se_1_10_###.dll (### is the Fallout 4 version)

2. Add F4SE to MO2

✔ Open Mod Organizer 2 and click on the Executables (gear icon).
✔ Click Add → Title: F4SE.
✔ In the Binary field, browse to:

C:\Program Files (x86)\Steam\steamapps\common\Fallout 4\f4se_loader.exe

✔ Set the Start In field to the Fallout 4 root folder.
✔ Click Apply & OK.

3. Launch Fallout 4 via F4SE in MO2

✔ In MO2’s drop-down menu, select F4SE as the executable.
✔ Click Run.
✔ The game should launch with F4SE and all mods enabled.

4. Verify F4SE is Running

✔ Open the console (~ key) in-game.
✔ Type:

GetF4SEVersion

✔ If F4SE is running, it will display the installed version.

5. Troubleshooting

✔ Ensure Fallout 4 is set to launch via MO2 and not directly through Steam.
✔ If F4SE doesn’t launch, try running MO2 as Administrator.
✔ Ensure your F4SE version matches the latest Fallout 4 update.

Conclusion

To start F4SE from MO2, install it in the Fallout 4 directory, add f4se_loader.exe as an executable in MO2, and launch it from the MO2 run menu. Verify functionality using the console command GetF4SEVersion.

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