Re: WinSCP 6.3.3 & 6.3.4 are end of life or end of support?
We are supporting 6.5 and 6.6 only:
https://winscp.net/eng/docs/support
The 6.4 might receive security fixes in exceptional situations.
https://winscp.net/eng/docs/support
The 6.4 might receive security fixes in exceptional situations.