Hi morettilacroix, Thanks for contacting Adobe support. I would like to inform you that if you have a windows serial number it wouldn't work on mac machine. However, if you have a mac serial number below are the steps to install CS 5 on MAC. Install Creative Suite products from the desktop | CS5, CS5.5, CS6 If you do now have a mac serial number, kindly upgrade to Creative cloud. Creative Cloud pricing and membership plans | Adobe Creative Cloud Thanks, Atul Saini
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