Refprop 91 Install Jun 2026

The default installation path is:

The installation begins with the official installer package provided by NIST or authorized distributors (typically delivered via download link or media disk).

You will need to point your script to refprop.dll . Ensure your Python environment is the same "bitness" (32-bit vs 64-bit) as the DLL you are calling. 6. Troubleshooting Common Errors refprop 91 install

Many external programming environments look for REFPROP files globally. To allow your system to find the core calculation engine (the DLL file) from any directory, you must add REFPROP to your Windows Environment Variables.

: For some applications (like MATLAB), you may need to set a system environment variable named with the value of your installation path (e.g., C:\Program Files\REFPROP 64-bit Compatibility : Version 9.1 and higher includes REFPRP64.dll , which is necessary for 64-bit applications like the REFPROP CAPE-OPEN Manager Common Troubleshooting Conflicting Versions The default installation path is: The installation begins

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.

REFPROP | NIST - National Institute of Standards and Technology : For some applications (like MATLAB), you may

Windows requires administrator rights to write to the C:\Program Files (x86) directory and to modify System Environment Variables.

If you are setting this up for a university or work environment, you may also look into "Mini-Refprop" versions. If you'd like, I can:

Go to File > Options > Trust Center > Trust Center Settings > Trusted Locations . Click Add new location and add the main C:\Program Files\REFPROP folder.