Thanks! There was an error in my procedure: I did not search via wildcard in HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* (-like WinSCP instead of -like WinSCP*)
Also many thanks for excellent link "Please Stop Using Win32_Product To Find Installed Software."

Case can be closed
Michael

The Win32_Product contains only applications installed with Windows Installer.
You have to use WinSCP MSI installer to be able to query the installation via Win32_Product.
https://winscp.net/eng/docs/installation#msi

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Regarding the registry query: WinSCP installer is 32-bit. So (assuming you are on Windows 64-bit) you need to query HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*

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Both is covered in
See also Please Stop Using Win32_Product To Find Installed Software. Alternatives Inside! | xkln.net

I do not find WinSCP (installed version 6.1.1) in the list of programs via:

or

but it is in system control | programs and functions.

I need PowerShell access to this information. What can I do?

Thanks – Michael