If your goal is to get REFPROP functionality without cost, I strongly recommend (open-source, high-accuracy, used in many research papers). Would you like guidance on using CoolProp or accessing legitimate free versions of REFPROP?
For single‑point properties (not mixture curves), the NIST WebBook is free and browser‑based. It uses the same underlying REFPROP routines. refprop 10 free download 2021
: It includes only a limited selection of fluids (such as water, CO2, R134a, nitrogen, oxygen, methane, propane, and helium) and does not provide technical support. : You can find it on the NIST MINI-REFPROP page Key Features of Version 10 Fluid Support If your goal is to get REFPROP functionality
: Highly optimized Fortran code for faster calculation speed and better convergence. Important Licensing Note REFPROP | NIST I strongly recommend (open-source