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(-1)

so when in the terminal I will put "Copy Spacecorpsxxx as pathname” and then  "sudo chmod -R 755” or vice versa. and when It comes to opening it will I just click the file or will I have to search for it by a command code? 

I feel like in getting closer but still, I'm trying.

(+1)

I had the same issue as you but I used terminal and followed what Rani said. After imputing your own Mac password, click on the game again and it should open. Worked for me!