I have noticed that the authentication system for the setup has changed.
I had also noticed that the setup.exe (GoTD standard setup) no longer extracted the "giveaway app setup" to the system temp folder... but only today I realized it is extracting the "giveaway app setup" from the .gcd contents to RAM (found this because the process was using an abnormal amount of RAM... which was about the same size as the Paragorn PM 12 gcd file) and launching the installer.
I assume this was for safety reasons but I think this may prevent some users from actually being able to enjoy the giveaway...