I guess NetHack 3.6.7 was out a few days ago? I don't know why there was
no announcement. I don't know what changes it has; waiting for the update
for my OS.
There was no "official" release announcement posted here or in
rec.games.roguelike.announce. That was an oversight rather than
deliberate. nethack.org had/has an announcement and there was
one posted on reddit in https://reddit.com/r/nethack and possibly
a couple of other places that I don't recall offhand.
There are binaries for Windows. Some linux distributions make them
available for their systems; traditionally Unix users are expected to
build for themselves from source code. These days, that only seems
to leave macOS (formerly OSX). There haven't been binaries provided
for it by nethack.org since 3.6.0. You can build from source, or it is
possible to obtain binaries via 3rd party tools homebrew or macports.
Don't get out of date 3.6.0 from the Apple Store. 3.6.1 and .2 and .3
all had substantial changes. 3.6.4 through .7 primarily address
potential security issues for multi-user systems, although each does
include a handful of fixes for game play problems.