It's important to keep in mind that the NTP software for Windows has not been written by Meinberg.
It's just the reference implementation of the NTP protocol provided by the NTP project at
http://www.ntp.org
Releases are normally available as source code only at the NTP community pages at
https://support.ntp.org
We at Meinberg support the NTP project by sponsoring, testing, submitting bug reports, and eventually
providing patches.
We also pick up the source code releases, build the binaries for Windows, provide them with a cryptographic signature,
and put them into a GUI installer/setup program to simplify installation under Windows:
https://www.meinbergglobal.com/english/sw/ntp.htm#ntp_stable
— Martin Burnicki martin.burnicki@meinberg.de, last updated 2021-02-10