Photoshop for 10.11.6 El Capitan

[#1]

Hi! I'm a student and have to use photoshop for one of my classes. My MacBook can't update past 10.11.6 and therefore I cannot download the latest versions of photoshop. Does anyone have any tips or links? Please, please, please!! 

[#2]

Hi! I'm a student and have to use photoshop for one of my classes. My MacBook can't update past 10.11.6 and therefore I cannot download the latest versions of photoshop. Does anyone have any tips or links? Please, please, please!!