In the new version of WinSCP, I see the binaries of 5.1.6. I think it doesn't update the winscp.exe with the correct version.
New: MBox Viewer (Mar 22, 2026), Platform 30.3 (Mar 29, 2026)
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I've confirmed this issue, and sent a fix for release.
Thanks! I am waiting that fix to add the new one into my PortableApps repository