Because he's a excentric crazy googoo, who works on older leaked files and with granddelusions that his vision of how l2 should be, is real l2.
And you seem to ignore that fact that helping you will be probably benefitless for the "developer".
You also have no grasp of L2Off and its mechanics contra l2j (my educated geuss).
Even if you offer money, your with a 100% hitrate going to create something lame that most of us developers, belive ruined l2off completely.
That being said, 90% of getting a server "running" is straight forward, with some knowledge of windows/networking/server applications.
TRY, and then ask questions.
Research what you have availeble out of the box, and test shit out, note differences from packs etc etc.
Logical deduction.