Unzip/Extract the zip file which you have downloaded and rename the folder inside the zip file to "redeal"
Create a zip of this redeal folder/directory with the same name "redeal"
Go to admin panel of your Prestashop1.7 store.
Click on "Modules" link in the left sidebar. See here:
Click "Upload a Module" link in the top right of the admin panel to upload the "redeal" module. See here:
After clicking on it you see a popup box where you need to upload the "redeal" zip file.
Once the zip file is uploaded successfully, you will find “Redeal” module in Prestashop module list. See here:
If you already have “redeal” module installed, it will update the existing module and its version. If it is not already installed, it will create a new module.
Click on install/configure button to configure this module. See here:
After successfully installation you will see Redeal Configuration Page. See here:
Do the configuration setting as per your requirement.
After that you can place order and can see Redeal popup in order confirmation page. See here: