If you have the original ISO or DVD for WinCC Professional or WinCC V7, the Viewer RT setup is located within the "Support" or "Additional Software" folders.
The Windows user on the remote PC must also exist on the WinCC Server with the exact same password, and must be part of the "SIMATIC HMI" user group. wincc viewer rt download fix
If you use complex C-Scripts or VB-Scripts, ensure that the "WinCC Runtime" is allowed through the Windows Defender Firewall on both ends. Summary Checklist If you have the original ISO or DVD