Install L2 twice

Is there any way to install Lineage II twice?
So i can play on L2Extreme with one version and with the other one i play on another erver?

plz answer fast ty

Install, copy the Lineage II folder, install both patches, each server's on one copy.

How do I install different versions of the game ? Like Interlude and c5.

Install older version, rename/move it somewhere else, install new one.

Damn its not that hard.