1) "L2 PRELUDe" folder, change name to "L2Prelude" w/o "space" 2) Delete system folder 3) Setup our updater http://files.lineage2classic.com/updater/Lineage2Classic_Updater.zip in you L2Prelude folder 4) Run updater, and 2 time press "Full Check" and try enter to game. PS: L2Prelude - its not Classic =)