MCNP is software developed by the US Department of Energy (DOE) at Los Alamos National Laboratory. Unlike open-source software (like OpenMC or Geant4), MCNP is export-controlled and requires a license to use.
If you are looking for a of MCNP6.2, it is important to understand the legal and security framework surrounding this software. MCNP is not open-source or "freeware." Because the code can be used for sensitive nuclear applications, it is classified as Export Controlled (specifically under Export Control Classification Number 3D991 or similar, depending on the version). mcnp62 download free
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MCNP6.2 is a proprietary, export-controlled software package developed by Los Alamos National Laboratory (LLNL). It is to the general public. The software is classified as Export Control Classification Number (ECCN) 3D001 under the U.S. Department of Commerce regulations and falls under the jurisdiction of the U.S. Department of Energy (DOE). Acquisition requires a strict vetting process, a paid license (unless the user is a DOE employee/contractor), and adherence to non-proliferation protocols. "Free" versions found on third-party sites are likely illegal, unlicensed, or potential cybersecurity threats. MCNP is software developed by the US Department