Yeah it isn't a permissions issue, it simply says the file cannot be opened. The executable bundle wasn't made correctly. You have to open a terminal, navagate to "[download directory/Elven\ Conquest\ 1.0.3\ \(mac\).app/Contents/MacOS" and then do a "chmod +x Elven\ Conquest\ 1.0.3\ \(mac\)". This means the developer never actually tested the mac version, which is frankly sad