He's not doing that for the current version to prevent leechers.
Back on topic, one way to get kill monster is to go into a monster map, kill a number of monsters, look at the list of possible monster opcodes, and search for the one that appears the same number of times as the number of monsters that you have killed.
Edit: By the way, I don't update GMS (due to the ip block), I only update MSEA, so I cannot provide GMS opcodes or check whether your opcode is correct.
kill_monster = 0x278 but something was changed and idk what -.-
I plan to release the source soon.. but the lack of help Im getting has only cause me to think otherwise also to prevent leechers and some angry flamers.
SPAWN_PLAYER isnt updated right ? I see many opcodes here that arent updated to 1.46
But there are some that are updated, those saves me a lot of time of sniffing from gms, too bad I already sniffed most of them from gms :/