You will need to update to the latest client ver. 1.5.0.9 to play at Infinite.
Also following files will be needed:
1)Original Launcher & download client (use Infinite launcher to play ; use this to download & update)
Turn off any AV program while downloading,because Your Av prog thinks aion.bin is a virus & interrupts download.
2)Files needed to to make aion client english.Copy files to L10N folder.
3)Infinite launcher