Since the automatic download is failing, you must manually provide the libraries to Solar-PuTTY. 1. Download the Portable WinSCP Package

: If the portable .exe is in a protected folder (like C:\Program Files ), it may not have permission to create the subfolder required for the libraries. Step-by-Step Fix: Manual Library Installation

If manual placement doesn't work, consider these workarounds: Solar-PuTTY - SolarWinds THWACK

Extract the contents of the WinSCP ZIP (specifically WinSCP.exe and WinSCP.com ) into this new WinSCP folder.