There is no legitimate "free download" link for the general public. Access is strictly categorized by user type:
Short answer: not as an open public download. The software itself is provided at no direct purchase cost to approved eligible requesters (e.g., academic, research, government institutions, commercial entities) but it is distributed under licensing conditions and export controls; you must register with RSICC and be approved. For many eligible U.S. users and for properly documented academic requests the distribution is effectively free of charge, but you cannot simply click a public “download” link and obtain it without going through RSICC’s request/approval process. mcnp62 download free
Important practical points:
The reason MCNP6.2 is not open-source or freeware is rooted in U.S. national security interests. There is no legitimate "free download" link for