@yve0789: WinSCP stores the log, where you configured it to store it. If you have kept the default
%TEMP%\!S.log
, then it logs to your Windows account temporary directory (i.e. typically to C:\Users\username\AppData\Local\Temp
) to a file with the same name as your WinSCP session. If you want WinSCP to log to a more convenient location, specify it in preferences.