I redeemed my code to download Yosemite DP1 back in June, but held off on actually installing it. Now that the public beta is about to begin, I've deleted the "Install Yosemite" app and re-downloaded it from the MAS, but it's still DP1. Do I have to install the first beta and then update to DP4? Or is there a way to install DP4 directly?