Navigate to the WinCC installation directory (typically C:\Program Files (x86)\SIEMENS\WinCC\WebNavigator\Server\Web\install\ ).

This prevents third-party services from interfering with the installation process.

Locate the client setup files (look for WinCCViewerRT.exe or WebNavigatorClient.msi ).

For newer WinCC versions (like Unified), ensure your OS is prepared to handle the runtime environment.