Many users reported that the game would randomly close to the desktop (CTD) during intense firefights or at the start of specific DLC missions.

If you are encountering issues with this specific version, community-sourced solutions from that era include: Date Trick:

The Zombie Army 4: Dead War crackfix v2 Empress new patch offers a way for players to access the game without purchasing it through official channels. While the patch provides a stable and smooth gaming experience, we strongly advise players to consider the risks associated with using cracks. Purchasing the game through official channels ensures that players receive official support, updates, and a secure gaming experience.