In (run from a USB drive or non-installed folder), a known issue occurs: Solar-PuTTY fails to download WinSCP libraries , resulting in error messages such as:
Extract the contents of the WinSCP ZIP (specifically WinSCP.exe and WinSCP.com ) into this new WinSCP folder.
When manual copy is the right choice (concise how-to)
Move the entire Solar Putty folder to C:\Users\Public\PortableApps\ and re-copy the Library folder.