Hi Vikas,
I ordinarily announce the arrival of new datasets via the forums. Once a set has been uploaded, I make no changes to it - further sets that relate to it, or "re-runs" will e marked accordingly.
I hope this helps.
Also, in filezilla a good way to check is to sort the modified date so that the new items are on the top.
You won't be able to accidentally delete files soon as i'll be modifying all the permissions
- but in the interim, please avoid the delete button.