Back to square one. You don't own a Mac so the Yosemite download is illegal.
It's quite simple: if you own a Mac you can legally download OS X. If you don't, you can't. It doesn't matter whether you never bought a Mac, you sold your Mac, you gave away your Mac, or your Mac was stolen. No Mac, no licence to download.
(Pardon the condescension. 😉)