TReK 5.4.0 ISS

Released October 1, 2025

Due to the lapse in federal government funding, NASA is not updating this website. We sincerely regret this inconvenience.
For International Space Station
Starting Documents
Download Links

Login required, see registration.

Compatibility

TReK is backward compatible with EHS HPEG (31.0, 33.0, 34.0, 35.0, 35.1, 37, and 38), but not forward.

TReK software export classification is EAR ECCN 9D515.a
Third party software is included.
Remove previous versions of 5 (and 3rd party software).
It is safe to leave TReK 3.
Both 32-bit and 64-bit DLLs are provided.
Do not mix 32 and 64-bit versions.
TReK Help library identifies required DLLs.
Cryptography services not available for 32-bit Windows.
Overview
Download
Support

NASA Official: Nicole W. Pelfrey
Human Exploration Development & Operations Office Manager

Content Manager: Patrick Meyer
Last Modified 10/1/2025