Decompress the contents of the archive into a new folder on your hard drive
Copy the archive contents into the administration folder of your website in order to obtain a path such www.yourWebsite.com/adminXXX/SC/index.php
Modify access rights to grant authorization to modify the Store Commander folder and its contents (you can take the rights of the /uploads folder to know what are the good ones)
Log onto your Prestashop back office and go to this link www.yourWebsite.com/adminXXX/SC/index.php in order to create your trial license and start Store Commander
Once Store Commander is launched, go to the menu "Tools > Installation" and then click on "Create a link in the Prestashop quick access menu"