Maplestory Installing Problem

Tried downloading and installing Maplestory today.
Downloading went fine, but installing gave problems.
First and second time, an error happened at character.wz.
Third time, an error happened at map.wz.
Both error codes were -40 Installation failed.
How do I fix this so I can play Maplestory?

Are you sure you have enough disk space for it?

Also, clean up any old MapleStory installation you might have.

I have 435 GB free.
And I've deleted every maplestory installation between each failed one.

Maybe your downloaded file is corrupted? I know it's tedious but you could try downloading it again

Well, that's what I've been doing recently.
Guess I just gotta keep trying.