A working YouTube 2007 player, the link is: http://web.archive.org/web/20180705115705/11pixels.ct8.pl/playertest.html if you have flash player it will work, also you can replace video in player by using inspected element and changing background: into
Flash Video - video downloader
Watch YouTube on Your Computer With HTML5 instead of Flash
player2.swf (YouTube Video Player - 2006) : YouTube : Free Download, Borrow, and Streaming : Internet Archive
YouTube use Flash Player – Szerezze be ezt a kiegészítőt a 🦊 Firefoxhoz (hu)
How to make an adobe flash video player. - YouTube
Watch YouTube on Your Computer With HTML5 instead of Flash