The "v1.0u4" designation indicates the fourth official update (Update 4) released for the game. In the era of its release (2014), these incremental updates were critical for:
Enemy Front distinguishes itself from other WWII shooters by focusing on the Polish Resistance and the Warsaw Uprising, rather than the standard D-Day or Stalingrad narratives. You play as Robert Hawkins, an American war correspondent who joins resistance fighters across France, Norway, and Poland. ENEMY FRONT Free Download v1.0u4
Today, the "Free Download" aspect usually refers to the game's status on various digital platforms or abandonware archives. However, for the most stable and secure experience, it is still maintained on official storefronts: The "v1