Re: location of session data in 4.3.6
Configuration (in any version) is stored either in registry
For details see:
https://winscp.net/eng/docs/config
HKEY_CURRENT_USER\Software\Martin Prikryl\WinSCP 2\
or in an INI file in the same folder, where WinSCP executable is.
For details see:
https://winscp.net/eng/docs/config