[support] can't install date or date_api module

I've downloaded the date module, but it just comes out as one file and not in a folder like other modules, and I've tried copying it into my sites/all/modules folder on it's own and also have made a folder named "dates" and put it here, and nothing makes it so my drupal installation can "see" the dates module so I can activate it. http://drupal.org/project/date Thanks, Tina