Well version 1.8 is supposed to remove that (overzealous) message from Apple and does so in my testing.
First, make sure you are really using GEDitCOM 1.8. If you download 1.8, but have not removed older versions of GEDitCOM II, a double click of a file is likely to pick the old one rather than the new one and the old one will have that message. A sure way to tell is to double click the new application icon to start it rather than starting from one of your genealogy files.
If you indeed have version 1.8 and are still getting the message, I will have to diagnose why the fix works for some people but not for you. In the meantime, you can change Mountain Lion security settings to allow GEDitCOM II to run and it will run fine. The application actually opens fine and it is just Apple choosing not to open it without giving you much useful advice on alternatives. I think you can even control click on the application and tell it to open.
On Oct 2, 2012, at 3:13 PM, Kim Andersen wrote:
> When launching GEDitCOM II, version 1.8, I get the following message:
> "GEDitCOM II" can't be opened because it is from an unidentified developer.
> Running on iMac 8,1 using Mac OS X 10.8.2.
GEDitCOM - Genealogy Software for the Macintosh