If you're looking to download or purchase RefProp 9.0 Portable, I recommend visiting the official NIST website or other reputable sources to ensure that you obtain a legitimate and up-to-date version of the software.

: It supports a vast library of pure fluids and predefined mixtures, including common refrigerants and natural gas components. Pros and Cons

was released in 2010, the software had grown from a simple refrigerant database into a complex calculation engine for 105 pure fluids and 639 binary mixtures. Key milestones that defined the "9.0 era" included: The GERG-2008 Model:

: If Refprop 9.0 is a software or database version, users might be looking to download or access it. A portable version would likely be designed for ease of use across different computers.

If you are a student, GitHub’s Student Pack gives you free access to many development tools. You can write a simple script using the official ctREFPROP (Community Edition) that calls a legitimate REFPROP installation. Do not download a "portable" GitHub repo containing DLLs—report it instead.