My Maple doesn't work!

All I did was edit the item.wz file to put in the B&W Combo (which looks awesome, thanks Kenny), and now my Maple doesn't open. It just goes black, makes a weird clicky noise, then there's an error that says "You appear to be missing a few files needed to run the game. Please visit maplestory.nexon.net and download the latest version of the client."

I really don't want to redownload the v62 file, which takes hours and hours on my computer. (8% done, 4 hours, 56 minutes to go according to Firefox)

You should have backed up your .wz files before messing with them. Rookie mistake XD

I do have the backup item.wz, which I renamed item.bak. But when I switched them out, it still didn't work.

Edit: Yes, I did rename the backup item.wz.

Edit again: I'm just 3 hours away from playing Roadside! D: