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As a legacy version, WinCC V6.0 SP4 is only compatible with older operating systems. It is supported on modern platforms like Windows 10 or 11. Download link for Step7 5.0 and Wincc V6.0? - SiePortal

Only if you have a valid license and need to reinstall a legacy system. Do not waste time hoping for a free “new” download from Siemens – it does not exist.