MCNP 6.2, released in April 2018, represented a major leap forward in the MCNP code lineage. For users of earlier MCNP6 versions, MCNP6.2 offers substantial improvements in computational speed, physics modeling, and usability.
To legally download MCNP 6.2, you must go through one of the two authorized software distribution centers. These are the "top" sources that will provide you with a genuine, digitally-signed installer, documentation, and technical support.
You won't find a legitimate MCNP 6.2 download on a "top 10" software site or a mirror link. There are only two primary authorized distributors:
Look for "MCNP6.2" in their software catalog.