This is a plugin which creates tables of products which have significant Amazon Discounts and displays them on a WordPress post or page.

Noted That:

To install correctly this amadiscount.zip.
Fisrt Download the amadiscount.zip to your computer
Extract/Open amadiscount.zip to Your Computer.
Then, Find readme.txt file inside amadiscount.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "amadiscount.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "amadiscount.zip" Downloaded plugin from your computer, Where you downloaded amadiscount.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "AmaDiscount Plugin" folder is added on left sidemenu. Now, Click on "AmaDiscount Plugin" folder.

Noted that: If you do not see "AmaDiscount Plugin" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about AmaDiscount Plugin Configurtions and Settings or How to work "AmaDiscount Plugin" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "AmaDiscount Plugin" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is AmaDiscount Plugin
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
For automatic installation: Login to your website and go to the Plugins section of your admin panel. Click the Add New button. Under Install Plugins, click the Upload link. Select the plugin zip file from your computer then click the Install Now button. You should see a message stating that the plugin was installed successfully. Click the Activate Plugin link. For manual installation: You should have access to the server where WordPress is installed. If you don’t, see your system administrator. Copy the plugin zip file up to your server and unzip it somewhere on the file system. Copy the “amazon discount pro” folder into the /wp-content/plugins directory of your WordPress installation. Login to your website and go to the Plugins section of your admin panel. Look for “Amazon Discount Pro” or “ADP” and click Activate.

Guide

For automatic installation:

Login to your website and go to the Plugins section of your admin panel.
Click the Add New button.
Under Install Plugins, click the Upload link.
Select the plugin zip file from your computer then click the Install Now button.
You should see a message stating that the plugin was installed successfully.
Click the Activate Plugin link.

For manual installation:

You should have access to the server where WordPress is installed. If you don’t, see your system administrator.
Copy the plugin zip file up to your server and unzip it somewhere on the file system.
Copy the “amazon discount pro” folder into the /wp-content/plugins directory of your WordPress installation.
Login to your website and go to the Plugins section of your admin panel.
Look for “Amazon Discount Pro” or “ADP” and click Activate.

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Reffered: https://wordpress.org/