2012 Mac Mini install problem. I went to install Mavericks and did the CMD+r at boot but it only gives me Mountain Lion as an option to install. So I install it, add my Apple ID, go to download Mavericks and app store shows a grayed out email and no way to change it. Went back, erased the drive using drive utility, repeated steps again, same issue. Searched on the web and only thing I see is that most issues with that error are from pirated apps which I have absolutely ZERO. Can I not install Mavericks with a fresh install using Recovery? Also, how can I trash the strange email that shows up in my login? I can sign out of MAS and iTunes and login successfully with my Apple ID but only when I try to download the free upgrade to Mavericks does this unknown email show up. Any help is appreciated.