Hi. JMatPro is a commercial software. You need to buy it if you want to use it for thermodynamic calculations. However, the company offers a demo version, which can be accessed in the link below:
https://www.sentesoftware.co.uk/demo
Demo version is free to use, but you can't perform any new calculations. You can access some demo calculations that are already shared with the demo software. With this limited capability, you should be able to evaluate the software.