Looks like there's a problem with the mac version. I'm getting this error.
“BOMBASTIC v1.0” is damaged and can’t be opened. You should move it to the Trash.
Hi, thanks for your feedback. We're aware of this problem. Apparently newer operating systems on Mac don't make it easy to open certain files downloaded from the internet, so you need to change your security/privacy settings in system preferences I think. It's not a damaged file, just something to do with the privacy on some macs :)