If you're still running Mac OS X Mavericks, no problem.
Sadly, this app doesn't work fine anymore others versions of Mac OS.
Please, if you can find this guy, tell him to come back and to update this marvel... I'm sure there are people ready to pay for software like this. This is simply the best ever folder icon design app I've seen... and used, even if some options are missing. I still use my elderly MacBook Pro late 2010 just to make my personal icons for my actual Mac.