use l2j-c2datapack branch stable
dont update droplist table (we changed nothing - gm changes will be lost if you update)
dont update buylist.csv (you have local changes)
dont update spawnlist - i will give you a custom set of inserts that add c2 spawns if you havent already added them
dont update your npc table, if you want dump your npc table to sql and put it somewhere so i can put collisions/fixes in but keep gm modifications
update skill_trees to skill_trees-c2 if you want (it contains the c1 skills and the c2 skills are good, elo did the work and ive rechecked it)
update all other tables that dont contain character data
update all html with html from the datapack