And the downloader, well, downloaded successfully, ending with a message box that said to 'install the application now', but nothing else is happening. I can't get it ton install even though apparently everything is downloaded now.
By default the Aeria downloader will save the installer to C:\AeriaGames\Downloader
The current installer is titled edeneternal_us_install_20111205.exe if it isn't in this folder then it is possible your antivirus has caused it to be deleted or some other error.
If it didn't save it try using the OnRPG mirror
or one of the other alternate downloads listed on the original post.