How To Install F4SE and Fix F4SE Not Working Error (2023)

The Fallout 4 Script Extender, known as F4SE, enhances the game’s scripting capabilities. However, this extender remains relatively unknown to many individuals. Additionally, users may lack awareness of the procedures to address potential errors associated with it. Therefore, we present a comprehensive guide below, offering step-by-step instructions for installing F4SE on your device.

How to Install F4SE on your Device?

Important: Before proceeding with this method, ensure that Nexus Mod Manager is installed on your PC.

Step 1: Open a web browser on your device and visit the official Fallout 4 Script Extender website using the link ‘’

Step 2: Download the 7z archive file from the website. Once the download is complete, use 7-Zip to extract the files from the archive.

Step 3: Launch Steam and right-click on Fallout 4 in the Library section of the menu.

Step 4: To access the Fallout 4 directory, select ‘properties’ from the drop-down box, then click on Local files >> Browse local files.

Step 5: Copy all the files extracted from the F4SE folder and paste them into the Fallout 4 directory you accessed in the previous step.

Step 6: Right-click on the Data folder within the F4SE folder, hover over 7-Zip, and click on “Add to ‘Data.7z'” to compress the folder.

Step 7: Right-click on the newly generated file and give it a custom name of your choice.

Upon completing all the outlined steps, the game will initiate exclusively through the f4se_loader.exe, situated in the Fallout 4 directory. You can conveniently add it to your desktop and customize its icon as desired.


Method 1: Update F4SE application.

Method 1: Installing F4SE

Step 1: Download the latest version of F4SE from the internet.

Step 2: Extract ‘f4se_1_10_120.dll,’ ‘f4se_loader.exe,’ and ‘f4se_steam_loader.dll’ to the Fallout installation folder.

Step 3: Launch the game using the ‘f4se_loader.exe’ file you just copied. Replace all files when prompted during the copying process.

Method 2: Run Compatibility Troubleshooter

Step 1: Navigate to the Fallout 4 installation folder.

Step 2: Right-click on the “f4se_loader.exe” file, select ‘Settings’ from the drop-down box.

Step 3: Go to the ‘Compatibility’ tab and click on ‘Run Compatibility Troubleshooter.’ Windows will automatically determine optimal settings for your PC. Test and apply these settings if the error is resolved.

Method 3: Add Fallout 4 Files to Windows Firewall Exception List

Step 1: On your Windows PC, go to ‘Updates & Security.’

Step 2: Select ‘Windows Security’ on the left, then choose ‘Firewall & Network Protection.’

Step 3: Locate and click on ‘Allow an App through Firewall’ and choose ‘Change Settings.’

Step 4: Grant access to all Fallout 4-related applications for both ‘Private’ and ‘Public’ networks. Click ‘OK’ and check if the error persists.

Method 4: Run as Administrator

Step 1: Right-click on the executable file of F4SE.

Step 2: Select ‘Run as administrator’ from the drop-down box. Check if the F4SE error is resolved. You can set it to always run as administrator from the compatibility tab.

FAQ: Frequently Asked Questions

Q1. Is F4SE necessary?
If you’re utilizing a Fallout 4 mod that necessitates F4SE, then the mod won’t function without it. However, if you’re using a mod that doesn’t depend on F4SE, then it isn’t required.

Q2. What is F4SE? F4SE stands for Fallout 4 Script Extender. As the name implies, it enhances Fallout 4’s scripting capabilities.

Q3. Is F4SE secure? Absolutely. F4SE is entirely safe for your PC, allowing you to use it without significant concerns.

Q4. How to resolve the F4SE not working issue? Various methods are available to address the F4SE not working problem. We’ve outlined them above, complete with detailed steps for your convenience.


This covers everything you should be aware of regarding F4SE 2021 (Fallout 4 Script Extender). The article provides guidance on installing F4SE on your device, updating it, and troubleshooting any issues with the not working error. If there’s any valuable information about F4SE that we might have overlooked, kindly share it with us in the comments section below.

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