There is also much easier way to play on different lineage Private Servers.
1. Remove your old version of Lineage2
2. Install fresh copy of offcial Lineage2 (from

)
3. Copy that folder as much as you want.
4. Now rename each copy. (example for Private Server "IsoGames" Rename the folder to "Lineage2 IsoGames" en another folder for "L2extreme" to "Lineage2 Extreme" , but the name is offcourse your own choice.
5. Now you can apply patches or whatever to every copy of the folder that connect to specific Private Server.
6. Place some shortcuts on your Desktop from every copy and Enjoy gaming on different Private Server from 1 PC
Good Luck