This editor is obsolete and has been replaced by Goombatlas: https://github.com/RicBent/Goombatlas
NSMBHD thread:http://nsmbhd.net/thread/3060-nsmb-worldmap-editor/#44015 (Also containing builds of v1.0-1.3)
Download the compiled version: http://www.mediafire.com/download/ignd6p1qca686oq/NSMB+Worldmap+Editor.zip
To run the editor you have to put the "Supporting Files" folder in the the same directory as the .exe You also have to do that while debugging.
I also give credit to the creators of NSMBe for using a few (maybe 15) lines of code from them