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(+1)(-1)

wont work for mac full stop 

(+2)(-1)

How much ram did you have, if you have low mac of course it will not work, but if you have minimal 2 gb ram it will work. Maybe try to redownload it. ¯\_(ツ)_/¯

(+1)

I have a macbook have you tried left click and then open the download?