If you have an old physical disc of Aion from 2009-2010, you already own the . You can install it and simply block the game via your Firewall to prevent patching. However, to play on a private 39 server, you will need to replace the bin32 folder with a "No-IP" or "Encryption" fix provided by the server.
If you are looking for the for version 3.9 to play on private servers or for archival purposes: aion 39 client full
This article covers everything you need to know. If you have an old physical disc of
This allowed players to find groups for dungeons across different servers, significantly reducing wait times. significantly reducing wait times.