The most reliable way to play for "free" is through a 14-day free trial of Xbox Game Pass for PC . This service includes both State of Decay: Year-One Survival Edition and State of Decay 2: Juggernaut Edition .
State of Decay 2 receives frequent free content updates that pirated versions cannot easily access. state-of-decay-pc-game-free-download-full-version
Offers the "Play Anywhere" feature, meaning if you buy it on PC, you also own it on Xbox consoles. The most reliable way to play for "free"