Re: Password with special characters working in older version!
See https://winscp.net/eng/docs/incompatible_changes#older_general
https://winscp.net/tracker/1014
5.8: Using UTF-8 for strings (such as password) with SSH protocol. If your SSH password contains non-ASCII characters, and you were able to connect with previous versions of WinSCP, it means that your server does not comply with SSH specification (as older versions of WinSCP did not). You will not be able to login with the new version of WinSCP. Change your password to ASCII characters only as a workaround.
https://winscp.net/tracker/1014