Use -neweronly:
https://winscp.net/eng/docs/scriptcommand_get#neweronly

Or even better, have WinSCP generate the code for you:
https://winscp.net/eng/docs/guide_automation#generating

Hi in a pre adjust window options you can see and select with a tick a option to do waht you want.

Please verify on a attach to see this.

Regards

hi,i have winscp 5.7.6 and i use sftp ..

how can i configure winscp to download from remote directory only files that doesent exist in local directory ?

thanks ,hagai