Documentation and update instruction is available online:
http://iqit-commerce.com/xdocs/warehouse-theme-documentation/
and https://www.youtube.com/watch?v=eYJh5k8VQKo

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UPDATE FROM OLDER VERSION
Please go to
"Prestashop 1_7_6_x - theme 4.3.x\Updates" folder and upgrade theme to 4.3.7 first.