Today’s Mac OS X Lion release is actually an older build than the Developer GM seed. Mac OS X Lion was officially released to the public on July 20th 2011. Apple requires you to download their latest software operating system through their Mac AppStore. You will notice that the build number is 11A494 and that the GM build number that was released to developers is 11A511.
Why is it that developers received a higher build number? If you try to download the RTM (Release To Market) build from the Mac AppStore while you are running the developer GM build you will get the error message: “Install Mac OS X lion 1.0.4 is already installed and was not purchased from the Mac App Store. Do you want to buy OS X Lion 10.7?”
I imagine Apple wants developers to purchase the final version and to do a fresh clean install from their Snow Leopard machine. As soon as we have information as to how developers can upgrade from Lion GM to the final build we will let you know.
Interesting note: If you look in the package for the developer GM release, at the info.plist file, you’ll see the following version number: 11A494