WinCC 6.0 (and its updates like V6.2) was designed to act as a window into the manufacturing process. It allowed operators to monitor machine health, control industrial processes, and log historical data.
While there is no permanent "free" full version of SIMATIC WinCC 6.0 wincc 6.0 download free
These are not WinCC, but they teach similar concepts – tags, alarms, trends, recipes, and PLC communication. WinCC 6