If you already own the simulator, the X-Plane.Org Forum is the primary hub for free (freeware) downloads, including: how to download a free plane - XP11 General discussion
: It provides the full simulator experience but is restricted to a 15-minute flight time and a specific geographic area (usually around Seattle-Tacoma International Airport). X-Plane 11 Free Download v11.41
: The demo can be upgraded to the full version at any time by purchasing a product key. Enhancing the v11.41 Experience If you already own the simulator, the X-Plane
For users specifically looking for "v11.41" content, this version was a peak for various visual and performance mods before the Vulkan transition. Many community members still share "presets" and "fixes" tailored for this build: If you already own the simulator