Chemstations CHEMCAD 6.5.6 | 181 MB Chemstations announces CHEMCAD version 6.0. The latest version builds on our commitment to innovation, integration, and open architecture with significant improvements in both the graphical user interface and the core engineering functionality of the program. Almost three years of effort, hundreds of hours of customer interviews, and decades of internal experience were focused to deliver a state-of-the-art process simulation package that seamlessly integrates into the wider chemical engineering computing environment.