I recommend downloading the latest trial version of the software because the older versions of AccuRIP are not supported anymore. The developers recommend Mac OSX 10.11 to be able to install it. Also, it's possible that the version you've downloaded to lack support for the version of Mac OSX running on your Apple product.
Here is the page to download the trial products: https://softwareforscreenprinters.com/downloads/
Note: A username is required to be able to access the latest version of the AccuRIP software. You can create one from the My Account screen.