Ok to play Aion go to this site
http://en.aion.gameforge.com/website/download down load and install aion. Run the program once. then close it and down load file AionLauncher.zip and unzip and put files in your aion folder as showed by picture below .
To play on crypthome aion server just run the AionLauncher.exe file to play on the aion server just run AION Free-to-Play icon. But doing so might upddate your game where you wont be abel to play on crypthome server