Legitimate software is digitally signed by the vendor (e.g., Sente Software). Cracked versions strip these signatures. Without a valid digital signature, the operating system cannot verify that the file has not been tampered with since its creation. Running unsigned executables creates a critical vulnerability in the system's integrity.
Depending on what you need to model, you might consider open-source thermodynamic tools like Thermo-Calc (which has a free educational version) or OpenCalphad Recommendation: jmatpro+v6+2+1+full+cracked+link