How do you download Korean Maplestory?

It depends on it.

Playing KMS require certain conditions.

Firstly to sign in you must have Korean social security number, only Korean can have

(which I have as well because I was born in Korea.)

Secondly You must understand Korean Language

Thirdly It depend on where you live, if you are not in certain Maple Story Version Area, You can play.

So If you are not Korean or living in Korea, you cannot play the KMS version.