Can't install PS CS5

been trying reinstall cs5 on computer because roommate broke old computer , i've been trying put on new macbook. when try downloading it, works, can't install when click on install option. comes up:

 

"'install' can't opened because unidentified developer. security prefereces allow installation of apps mac app store , identified developers"

 

now can do? frustrated because i've been trying half week , live chat reps told me come here since couldn't me because don't offer live chat support cs5...which crap.

 

anyway, can help!!

so change security prefs allow it...

 

https://www.google.com/search?q=your+security+prefereces+allow+installation+of+only+apps+f rom+the+mac+app+store+and+identified+developers

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