Our website provides a free download of REFPROP 9.1. The program lies within Development Tools, more precisely Database Tools. This software was originally produced by NIST.
From the developer:
This program calculates the thermodynamic and transport properties of industrially-important fluids and their mixtures.
You may want to check out more software, such as MySQL Workbench, SQL Packager or IB Expert, which might be related to REFPROP.