Select a fluid (e.g., Water) and click “Calculate Saturation Table.” If numbers appear, your installation is healthy. Open Microsoft Excel (2007, 2010, 2013, 2016, or 2019). Go to File > Options > Add-ins . Look for “NIST REFPROP Add-in” under Active Application Add-ins. If not listed, manually load it via Browse and navigate to:
A: Not natively. You can use AutoIt scripts or response files if you extract the MSI using Universal Silent Switch Finder. Conclusion: Mastering Your REFPROP 9.1 Install Completing a successful refprop 91 install is a rite of passage for engineers working with thermodynamic properties. While newer versions exist, version 9.1 remains a reliable workhorse for legacy systems, academic replication, and enterprise simulation pipelines. refprop 91 install
A: Some CD distributions of REFPROP 9.1 span two disks. Download the full ISO or copy both disk images to the same folder. Select a fluid (e
echo %REFPROP_PATH% It should return the full installation path, e.g., C:\Program Files (x86)\REFPROP\ . If not, manually add it: Control Panel > System > Advanced system settings > Environment Variables . Even following the steps perfectly, you may encounter errors. Here are the most frequent issues with refprop 91 install and their solutions. Error 1: “The setup files are corrupted. Please obtain a new copy of the program.” Cause : The installer was partially downloaded or modified. Solution : Obtain a fresh copy from your original backup or a trusted source. Compare the MD5 checksum with NIST’s archive if available. Error 2: “License file not found” even though it exists. Cause : The license file is in the wrong location or has wrong line endings (Unix vs. Windows). Solution : Copy the license file directly into C:\Program Files (x86)\REFPROP\ . Open it in Notepad, save as plain text with ANSI encoding. Error 3: “Component ‘MSCOMCTL.OCX’ not found or incorrectly registered.” Cause : Missing Visual Basic runtime components on newer Windows versions. Solution : Download the VB6 runtime library from Microsoft (if still available) or copy MSCOMCTL.OCX from a working older PC. Then run: Look for “NIST REFPROP Add-in” under Active Application
regsvr32 C:\Windows\SysWOW64\MSCOMCTL.OCX Run Command Prompt as administrator. Cause : Path mismatch or missing fluid database files. Solution : Reinstall using the Custom option and explicitly select every fluid group. Alternatively, set the environment variable REFPROP_FLUID_PATH to the folder containing .FLD files. Error 5: Installation freezes at “Registering components.” Cause : Permissions issue with Windows Registry. Solution : Run the installer under the hidden Administrator account. Enable it via:
C:\Program Files (x86)\REFPROP\REFPROP.xla Type =REFPROP("Water","T","P",300,101.325) into a cell. It should return a density value. Open Command Prompt and type:
Among the various versions released over the years, holds a special place. It represents a stable, mature build that balances modern fluid databases with broad operating system compatibility. If you have searched for the term "refprop 91 install" , you likely possess a legacy license or a specific need for this version—perhaps to align with legacy models, textbooks, or corporate standards.