Refprop 91 Install ((full)) -

Check . Even if you don’t think you need them now, you will likely appreciate them later.

After installation, you should verify everything is working as expected.

A very common problem is that when users attempt to upgrade from an older version (like 9.1) to a newer one (like 10.0), the new installer fails or the new version is not functional.

rho = Density(Water, T=300, P=101.3)

Version 9.1, released in 2013, was a major update that expanded the database to . The introduction of a 64-bit DLL significantly improved performance for complex calculations and integration with modern software like Excel and MATLAB. While newer versions exist, 9.1 remains a widely used and stable standard in many engineering and academic settings.

Article last updated: 2025 – for informational purposes. NIST REFPROP is a registered trademark of the National Institute of Standards and Technology.

Before you start, ensure your system meets these modest requirements: refprop 91 install

Right-click the setup executable and select . This ensures the installer can write to protected directories like Program Files and modify system registry keys.

By following this guide—preparing your system, running the installer with administrative privileges, correctly applying your license, and verifying the installation—you can avoid the common pitfalls that frustrate many users. Remember that the most frequent issues stem from missing VB6 runtimes, antivirus interference, or lost license files.

Some older installers trigger false positives in modern antivirus software (e.g., Windows Defender, McAfee). The installer uses self-extracting archives that may be flagged as suspicious. Disable real-time protection just for the installation duration, then re-enable it afterward. A very common problem is that when users

Installing NIST REFPROP 9.1 requires a bit more care than a typical consumer program, primarily due to the importance of a clean uninstall of older versions. However, by following the step-by-step guide and using the troubleshooting tips, you can set up this powerful thermodynamic property database with confidence. Once installed, the 64-bit DLL enables seamless integration with your primary engineering tools like Excel and MATLAB, providing you with a world-class property calculation engine for your projects.

If using the popular thermophysical property library , you can route calls to REFPROP by initializing it inside your script: