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Hey, probably a silly question, but you downloaded the Mac version, right?  If so, you should just have to run Jimmy and the Pulsating Mass.app.  If you're doing all of that, is it coming up with an error message or what?

yes i downloaded mac version. error message says 'this application jimmy and the pulsating mass' can't be opened'... deleted and redownloaded.. I also put the file.app to applications

Have the same problem.