OK, see this example. It does opposite of what you need, so it should be pretty easy to modify it:
https://winscp.net/eng/docs/script_download_most_recent_file

Alternative, and way easier, solution is to filter files smaller than 5 MB:

See https://winscp.net/eng/docs/file_mask

thank you for reply.

yes you can say new file.

ex: there will be some 5 files in folder.
there will be 5 MB limit for each file
1st file will be generated, after 5MB second will be generated. other files follow the same
But last file will be the new one which will be modified upto 5MB
so i dont want to syn new or last file to local folder
please confirm how to do it.

What does it mean "the last file"? The newest file?

Dear Team,

I am running Synchronization for local and remote.
In Local, i require all files to be synched except last file.

currently this is my script

open vishal@10.176.12.5
synchronize local "d:\cmdlogs\KKBNGBTPMBS02\"
exit