Ran into the same problem, here's a temporary solution.
I had Gatekeeper disabled, so just to be safe disable gatekeeper by going into System Preferences -> Security & Privacy, then select "allow apps downloaded from anywhere"
open up the Terminal app, navigate to your applications folder where Bean Loader.app sits. By default it is in the Applications folder unless you moved, so type :
then open up the application package by typing :
cd Bean\ Loader.app/Contents/MacOS/
and finally, launch the application from the shell by typing the following
and press return for a happy ending.
I have reason to believe this entirely bypasses Apple's developer hostile and un-friendly security measures, so it should hopefully work regardless of your OS.