Hi I've plunged into Yosemite when the public beta came out, but there are just too many bugs that keep me from using my mac normally. Thus i've downloaded a delta upgrade for developer preview 4 (from DP 4 to DP 5), hoping that it would upgrade my PB 1 to DP 5, but it failed. I've also edited my build number in "CoreServices" from 14A299l to 14A298i, hoping to trick the upgrade to believing that I'm running DP4, but it failed as well.... Anybody knows how to do the upgrade? Thanks!