Neither of these provides a “download and play offline” experience out of the box. You cannot install them on a laptop and play on an airplane.
Let’s address the core keyword directly. Con Artist Games never released a standalone, DRM-free, or offline patch. The game was engineered from the ground up as a client-server application. Here’s why: The Last Stand Dead Zone Offline Download
Dead Zone was . It required a persistent internet connection because: Neither of these provides a “download and play
If you see one, it’s either fake, broken, or malicious. it’s either fake