Fedora Past Versions

Hi i'm JF Agno, I'm no expert in using fedora but i have been using it for 2 years now and i pretty much like it. The latest update f16 somehow slow down my computer and i think the reason was due to may graphics i think it can't take the new features in f16. So what i want now is to go back to the previous versions around f13 or f14 because this past versions worked pretty awesome in my laptop. The problem that i have now is that i can't find any download link to the previous version can you help me in this problem? Hope to hear from you soon. Thanks! -- JF Agno http://www.mybravetruehero.com