You are likely to find buggy, early builds that lack the final updates made by the developers.
While Mesozoica offered a unique vision, the "free download" route is rarely worth the risk to your hardware. If you're a die-hard fan of the project's aesthetic, keep an eye on official sales or explore the modern "golden age" of dinosaur tycoons currently available on PC. mesozoica-pc-game-free-download-full-version
Many sites offering free downloads of paid games bundle files with malware or adware. You are likely to find buggy, early builds
Without the Steam API or official servers, many game mechanics may not function correctly. Is the Game Still Available? You are likely to find buggy
