The only way I was ever able to get one was to use a download manager, and type in the address of where I knew it to be... however, it's not going to do you anymore good than it would to just watch it over and over and over -- it's not editable -- the .swf file is exported from the .fla file which I **nearly** guarantee you is not on the site...
BUT!!! there is good news -- the guy who frequents this forum, davdesign is always making up .fla's and posting them for people to use and look at -- he does some really nice stuff, too, and will even explain to you what he did if you just ask -- so find a post by him, and follow his link that he always posts to his website, and have a blast!