That's what WinSCP does by default. Maybe you have disabled the confirmation:
See Confirmations > Overwriting of files:
https://winscp.net/eng/docs/ui_pref_environment

How about give a warning and then let the user make decision to replace or skip?
For my case, I just need to skip the downloading.
Thanks,
Shicheng

So what do you want WinSCP to do when downloading files that already exists locally?

Hi everyone,

I’m looking for advice on how to avoid overwriting my local files when downloading from a remote server using WinSCP's GUI. Is there a specific setting or workaround to ensure my existing local files aren't replaced during the transfer process?

Any help or suggestions would be greatly appreciated!

Thanks in advance!
Shicheng