Is there an official location for this project, with source code etc.? Forgive me if I sound paranoid, but downloading a binary from a random Dropbox is a little weird.
It is VERY weird. However, that dropbox link is indeed on the launchpad page that robotfelix posted. If you trust the page, I suppose you can trust the dropbox link.
I wonder if there's any chance it could be made to work on Homebrew...?