: Windows XP Professional or Windows 2000 Professional/Server.

If you are looking to learn WinCC or test its features, Siemens offers contemporary options: Delivery Release: SIMATIC WinCC V6.0 - ID - Support

portal, but these require an existing license number to use. System Requirements (V6.0)

If you have the original media and are attempting to install it, keep in mind its very specific, older hardware and software requirements: Operating Systems

: WinCC V6.0 was released in 2003 and has since been replaced by newer versions like V7.x and SIMATIC WinCC V8 Updates and Service Packs

Finding a "free" download for Siemens SIMATIC WinCC 6.0 is complicated because it is proprietary commercial software and an legacy version that has been largely phased out. Official and Legal Status Not Freeware : Siemens WinCC is licensed software and is not available for free as a full version. Legacy Version