If you need the official download link for the free demo: → Search "X-Plane 12 demo" or go directly to (I cannot provide clickable links, but it's easy to find).

There is no legal way to download the complete, unrestricted version of X Plane 12 for free. Laminar Research is a company that invests millions of dollars into development, accurate aircraft modeling, and flight physics research. The full version retails for approximately $79.99 USD .