open terminal
type in this
cd
cd Applications (if it is in your applications' folder, if it isn't, just drag it in)
cd /Applications/Geographical\ Adventures.app
cd Contents/MacOS
chmod +x 'Geographical Adventures'
now open it, if it says it can't open because of unidentified developer, just open system preferences, go to security and privacy and just press open anyway under the general tab.
Worked for me, hope it helps!