Refprop 91 Install May 2026

Navigate to Start Menu > NIST REFPROP 9.1 > REFPROP. The application should open, showing a window titled “NIST Reference Fluid Thermodynamic and Transport Properties Database.”

Select a fluid (e.g., Water) and click “Calculate Saturation Table.” If numbers appear, your installation is healthy.

Q: Can I install REFPROP 9.1 on Windows 11?
A: Possibly, but it is not officially supported. Users report success using Windows 10 compatibility mode (right-click installer > Properties > Compatibility > Run as Windows 10). refprop 91 install

Q: I lost my license file. Can NIST reissue it for version 9.1?
A: Likely not. NIST strongly encourages upgrading. If you have proof of purchase, contact refprop@nist.gov – but be prepared for a “no.”

Q: Does REFPROP 9.1 include mixtures?
A: Yes, it supports binary and pseudo-binary mixtures. Use the “Mixture” menu in the GUI or the REFPROPm DLL. Navigate to Start Menu > NIST REFPROP 9

Q: Why does the installer ask for a disk 2?
A: Some CD distributions of REFPROP 9.1 span two disks. Download the full ISO or copy both disk images to the same folder.

Q: Is there a silent install for enterprise deployment?
A: Not natively. You can use AutoIt scripts or response files if you extract the MSI using Universal Silent Switch Finder. Click Install and wait 1–3 minutes as files copy

Click Install and wait 1–3 minutes as files copy. At the end, uncheck “View Readme.txt” unless you enjoy highly technical legacy notes. Click Finish.

If you need to perform a clean refprop 91 install because the first attempt failed:

A successful REFPROP 9.1 install begins long before you double-click the setup file. Follow this checklist to avoid frustration.