I've bought Minecraft already from your website and wanted to download it onto my new mac. So i logged in and then download the app. then i opened the .dmg file and dragged it into my applications. i then opened my applications folder and located Minecraft. i opened that app and it asked if i wanted to open it due to me downloading it from the internet and i selected open. After opening Minecraft it didnt load and gave me the message of 'Minecraft quit unexpectedly'.

I've researched and found out that the reason for crashing is an Illegal Instruction - (EXC_BAD_INSTRUCTION / SIGILL)

How can i fix this issue?