Downloading virtual Smartfade software to a mac

I know there has been discussion on this topic but I am still confused.  I have a MacBook Pro OS X Yosemite v. 10.10.5 and am soon to purchase an ETC SmartFade 24/96.  I would like to get some practice using the virtual console, however I have tried to down load it to my mac and it says that the software is not from an authorised app supplier, so will not let me download it.  Can anyone help?

My wife has a Windows PC, so I could use this as a last resort if necessary.

Phil 

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