Can someone check if the Holiday Tree Ring throws an exception in this condition?

Sorry, I misunderstood your last question. I don't know much about Nexon code other than the WZ files, but here's the codebase for WzComparerR2 that I forked my repo from:
https://github.com/Kagamia/WzComparerR2

And this was his commit that fixed the patching format for 64 bit:
https://github.com/Kagamia/WzComparerR2/...7ca897df33

Here's my fork of it:
https://github.com/PirateIzzy/WzComparerR2


With WzCR2, go to Tools -> Patcher, select the Patch File and the MapleStory Folder, and then you can patch it.

Ahhhh, that answers my question, thank you! I see that his source code does have the 1125 KMST update in it. Good to know.

I was hoping to find a Nexon EXE patcher so I could make prepatchers from that to update NXPatcher easier.