Could you please try verifying your installation?
To verify UEFN on the Epic Game Launcher:
- Open the Epic Games Launcher**.**
- Find Unreal Editor for Fortnite (UEFN) in your Epic Games Library.
- Click the three dots on the right side of the UEFN line.
- Select Manage.
- Click the Verify button.
- Wait for validation to complete.
- It may take a while to verify all your files.