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I have a 2010 Mac mini running El Capitan (OSX 10.11.6). I downloaded and installed sage-8.0-OSX_10.11.6-x86_64.app.dmg. The MD5 checksum was correct. When I first tried to run the app, it failed to run because it was "from an unknown developer." I followed the procedure to override this, and now, when I click on the icon in launchpad, nothing happens. Have I downloaded the wrong file? Is there a way to run the app from the command line so that I might at least get an error message?