If you are looking to try the game before purchasing, here is the current official status:
There have been discussions within the community regarding the lack of a free demo to help new players navigate the game's high complexity and learning curve. WARNO Free Download (v68032)
There are small, independent fan-made projects such as Krug KABOOM that are free and require no download, though these are not the full WARNO experience. Key Game Facts: Genre: Realistic Cold War real-time strategy (RTS). If you are looking to try the game