I asked about this on TidBits and here are the first two replies for background 
to the problem:

On 12 Nov 2013, at 10:08, Curtis Wilcox wrote:

> (First reply)  

> Yes, this is Gatekeeper which was introduced in OS X 10.8 (and added to OS X 
> 10.7). Software developers cryptographically sign...
> 
> Lots of legitimate code won't be signed, especially open source software from 
> a site like Sourceforge......

> On Nov 12, 2013, at 9:28 AM, Neil Laubenthal <[email protected]> wrote:
>  
> (Second

> reply)  
>> When you get the "in trusted developer" dialog, you can also right click the 
>> app and do Open and then acknowledge the security warning. 
>> 
>> neil

On 12 Nov 2013, at 08:10, [email protected] wrote:

> On Saturday, October 26, 2013 7:17:39 PM UTC+9, Selim Benyelles wrote:
>> Hello.
>> My computer will not allow Mnemosyne to install, because the downloader 
>> "Sourceforge" is unknown to my system. I can download the installer but 
>> that's all.
>> Any solution ?
>> Thanks.
> 
> I solved this problem by going into the Security tab in my System Settings.  
> There was a dialog there that allowed me to bypass this protection.

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