* Download the files from git repo
* Extract files
* Open Directory, You see tochatwhatsapp-master. Rename it to tochatwhatsapp & Zip it.
* Go to Shop Backend > Modules > Module Manger
* Top Right Corner, you see Upload a module. Click here and select your file
* the module will be installed on your shop.

* Connect to server using FTP client.
* Switch to Directory modules in prestashop root directory
* Create a directory with name "tochatwhatsapp"
* upload all the files which downloaded from repo inside "tochatwhatsapp"
* Go to Shop Backend > Modules > Module Catalog
* here you see the module Tochat Whatsapp 
* Click Install.

Admin > Modules > Module Manager > Find module Tochat Whatsapp > Configure

NOTE: DO NOT FORGET TO ADD CRON FILE ON SERVER. You can have the cron url in the CONFIGURATION