I loaded the public beta 2 on an external drive and used that to boot onto my mac mini several weeks ago to preview the changes. I played with Yosemite a little, and then switched back to Mavericks on the mini. Since then I've loaded Yosemite beta 4 (then 5) on my laptop and am ready to make the switch to Yosemite on the mini. However, when I try to download it from the purchases section of the app store (from my mini) I get an error message and It will not download. Does anyone know how to get Yosemite on my mini??