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.

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: refprop 91 install

[rho, h, s] = refpropm('DH','T',300,'P',101.325,'water'); While REFPROP 9.1 predates widespread Python support, you can still call its DLL using ctypes : A: Some CD distributions of REFPROP 9

A: Likely not. NIST strongly encourages upgrading. If you have proof of purchase, contact refprop@nist.gov – but be prepared for a “no.” If not, manually add it: Control Panel >

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.