[support] download/upload plugin

[nicola at nicoladefilippo.it]

Hi,
i'm drupal newbie, i need a plugin that allows a user to
upload and download a file only during a certain period of
time (after a time should not be more as possible). I saw
the list of modules but I could not find it. Can anyone tell
me how can I do? 

           Thanks
                      Nicola