Help!

Hello. So I followed all of the steps to play Gamez Aion. I installed NCSoft Launcher. Installed Aion. Installed Gamez Aion Launcher. I downloaded the file for downgrading but I noticed that when I was extracting to the NCSoft/Aion file, there was a whole bunch of errors. I used WinRar and there was a pop up of diagnostic messages of errors. I tried to ignore that and launched Gamez Aion. The log-in screen came up. I signed in and I noticed that Lumiel was available but not Siel. When I selected Siel, it said 'No game server is available to the authorization server'. So how do I fix that? I really want to play. I'm fairly new to all this.