over 4 years ago - FatsharkJulia - Direct link
  1. Press the Windows key + R
  2. Enter %appdata% and select the ‘OK’ button
  3. Navigate to AppData\Roaming\Fatshark\Vermintide 2
  4. Right-click user_settings.config and select ‘Properties’

Under ‘Attributes’, is the ‘Read-only’ checkbox selected?

If so, please deselect it and apply the changes.