If you must use WinCC 6.2 (legacy system)
This article will explain what WinCC 6.2 is, why downloading it is legally and technically complex, where you might find it legitimately, and what your alternatives are. Wincc 6.2 Download
: If he didn't change the WinCC project's "computer_name" property to match his current machine's network ID, the server would throw an exception and refuse to open. The Migration Path If you must use WinCC 6