CC 2019

Win : root ://Users/username/AppData/Roaming/Adobe/Common/Motion Graphics Templates/
Mac : username/Library/Application Support/Adobe/Common/Motion Graphics Templates/

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CC 2017 | CC 2018

Win : root ://Users/username/AppData/Roaming/Adobe/Common/Essential Graphics Templates/
Mac : username/Library/Application Support/Adobe/Common/Essential Graphics Templates/