You can download the game or use the itch.io app for a portable version. Installation Guide for Windows
A community-maintained version is available for free on Steam . Warzone 2100 Download PC Game
Run the installer and follow the on-screen prompts. If using the traditional installer, you can choose to automatically download campaign videos (highly recommended for the full experience). You can download the game or use the itch
Visit the Warzone 2100 Project to download the latest stable release for Windows, macOS, or Linux. Warzone 2100 Download PC Game