OSX Yosemite installed BETA (are not appearing in AppStore purchase history list)

Hello Guys, I have one Macbook Middle 2009 with El Capitan 10.11.6, this OS is making me crazy, my music software just crashes, my browsers aswell even safari, my bootcamp with windows disappears just like that... So I need make a urgent Downgrade for the stable OSX Yosemite (it never let me down).
My point is when I go to Purchase History from AppleStore it list me OSX Lion, Mountain Lion, Mavericks and El Capitan, and not Yosemite because I installed it while it was Beta... I really need the Yosemite, I google for a lot of time, they say we can download it from Developer Free Account in Apple but I can't find any link or anything... Can u just help me.