Lockheed Martin's is not available as a free download. It is a paid, commercial-off-the-shelf simulation platform available strictly through digital download after a license purchase. Licensing and Pricing Structure
: Intended for students in K-12 or undergraduate programs. It provides the same functionality as the professional version but includes a small watermark in the upper right corner of the window. Prepar3D V4 Free Download
: Used for advanced training where complex combat scenarios may be rehearsed. Lockheed Martin's is not available as a free download
: Allows registered developers to support their testing and marketing efforts. Authentic "Free" Components Prepar3D V4 Free Download
Although the core simulator requires a purchase, some related components are free: License Options - Prepar3D
: Designed for businesses and organizations for training and instruction.