Thank you !!
the /info command shows that we should be compatible.

i agree that the latest version needs to be used and have updated in our qa/test area on its
way to prod.

Use the /info command-line parameter to list the supported algorithms.
https://winscp.net/eng/docs/commandline#auxiliary

Though you should use the latest version of WinSCP.

One of the servers I attach to is making changes.
How do I know that WinScp (version 5.17.2 (build 10278) supports these changes ?
I need to ensure that WinScp (version 5.17.2 (build 10278) supports at least one of the following approved key exchange algorithms:
 Curve25519
 Ecdh-sha2
 diffie-hellman-gex-sha256
 diffie-hellman-group15-sha512
 diffie-hellman-group14-sha256

Thanks