Refprop 91 Install Fix -

Purchase or download the installer through the official NIST Standard Reference Data Program. Ensure you have your specific license key ready.

: Ensure all default components (Executables, Fluid files, Mixture files) are checked. Click Next .

Download the executable installation file (usually named REFPROP91.EXE or similar). Step 2: Run the Installer Locate the downloaded installation file on your computer. Right-click the file and select .

The application opened the DLL successfully, but the DLL looks for the fluid database ( .FLD files) in its local directory and fails. refprop 91 install

If you have REFPROP 10 installed, you can still use the 9.1 interface for backward compatibility. NIST provides a specific REFPRP91.XLA patch to help version 10 users run older spreadsheets without changing formula syntax.

Ensure EES points to the correct REFPROP version via Options > REFPROP Path .

Ensure your system path includes the REFPROP folder so MATLAB can call the underlying refprop.dll . Python Integration (via ctREFPROP or CoolProp) Purchase or download the installer through the official

: A licensed copy of the REFPROP 9.1 setup executable (typically named Setup.exe or delivered via a digital download link from NIST). 2. Standard Desktop Installation

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.

To activate the full version:

Many external applications access REFPROP via its Dynamic Link Library ( REFPROP.DLL ). For your system to locate this library globally, you must add the installation path to your Windows Environment Variables.

If Excel can't find fluid data, copy the *.FLD and HMX.BNC files into a default directory like C:\REFPROP\FLUIDS .

The most common use case for version 9.1 is within Excel via the Locate the Add-in REFPROP.XLS in your installation folder. Save a copy as REFPROP.XLA REFPROP.XLAM to your local "Add-ins" folder. Set Trusted Locations Open Excel and go to File > Options > Trust Center > Trust Center Settings Trusted Locations and add the folder C:\Program Files (x86)\REFPROP Activate the Add-in File > Options > Add-Ins In the "Manage" dropdown at the bottom, select Excel Add-ins (or browse to find the file if it's not listed). Fixing DLL Links : If functions return errors, press to open the Visual Basic Editor. Check if the path to REFPROP.DLL in the module matches your actual installation path. National Institute of Standards and Technology (.gov) 3. Installation on macOS Click Next

Read the NIST license agreement, select I accept the agreement , and click Next .