Mac build not working?! Quick help please

So I have to finish a school project with unity, I zip it and transfer it via USB Stick to an iMac (which isn't the newest, it has OS X Yosemite) but the build is not responding if I double click the .app data. The app icon just appears on the bottom for a second and disappears again. I have also tried on the iMac at home (which is even older, latest version of OS X El-Capitan) and exact same problem. I have already tried turning GPU skinning on, building a developer build and turning on other stuff such as Optimize Mesh Data, Fullscreen window for Mac, Mac Appstore Validation etc but non has helped. The windows and Open-GL builds work fine, what should I do???