About an hour ago I got a notice about the latest El Capitan update (beta 3 I think). I downloaded it and on the reboot process, the "gas gauge" got about 3/4 done and then it FROZE! Am I toast? I had a similar failure with the beta for Yosemite and ended up having to go into an Apple store to get a reinstall of Mavericks. Lost everything, but it wasn't that bad since most of my important stuff is on my iMac. Any suggestions as to what I should do with the installation hung. I haven't done a thing yet as I'm hoping for a fix that will get my MBA back up and running. It's been running fine on El Capitan Beta 2. Would certain appreciate any help.