(MAC) i can't delete my sims 3 expansion pack ..the original uninstaller is gone [ Edited ]

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I downloaded sims 3 super natural but I'm wanting to delete it as I'm not enjoying it anymore and its messing my other games up but the problem is when i go onto my uninstaller to unistall it this message comes up that says "The operation can’t be completed because the original item for The Sims™ 3 Uninstaller can’t be found." what can i do i really want to uninstall it and have no idea how to anymore?! I have a macbook pro.