Yeah apologies the Version was 50, I couldn't remember exactly off the top off my head.
Regarding Ep4 Skills it's a dead end don't even bother trying. Even though we have the Ep4 Skill Data, we do not have the Ep4 Skill Game Logic coded into the Game Server Executable.
In order to get it to work you would need to create an external app that hooks into the Game Server and adds the game logic for the Ep4 Skills, and modify the Skill packet structure format. To sum it up getting Ep4 Skills to work is very very difficult.
As I've said the only real guaranteed solution would be to create an Open Source project on emulating the Game Server. If someone has experience in Server-side Emulators and would project lead, I would be happy to donate some of my time contributing.