Clickback adds a small line of code to your WordPress site so you can identify companies who have visited your website but haven't converted.

Noted That:

To install correctly this clickback-web-tracker.zip.
Fisrt Download the clickback-web-tracker.zip to your computer
Extract/Open clickback-web-tracker.zip to Your Computer.
Then, Find readme.txt file inside clickback-web-tracker.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 "clickback-web-tracker.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 "clickback-web-tracker.zip" Downloaded plugin from your computer, Where you downloaded clickback-web-tracker.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

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

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

8. Now you configure yourself oR Watch video tutorial below about Clickback Configurtions and Settings or How to work "Clickback" 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 "Clickback" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Clickback
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide
Log into your website’s WordPress administration section. From the Plugins page, click the Add New button. In the search box type “Clickback” Click the “Install Now” button. Once installed, it will turn into an “Activate” button. Click that button. Click the Settings link for the plugin. Copy the account token found on the Tracking Code page into the Token field. Click the test link to check your token. Click Save Settings C:\VS2013 Projects\ClickbackWEB\Prototypes\WordpressPlugIn\WordpressPlugIn\WP SVN\

Guide

Log into your website’s WordPress administration section.
From the Plugins page, click the Add New button.
In the search box type “Clickback”
Click the “Install Now” button.
Once installed, it will turn into an “Activate” button. Click that button.
Click the Settings link for the plugin.
Copy the account token found on the Tracking Code page into the Token field.
Click the test link to check your token.
Click Save Settings

C:\VS2013 Projects\ClickbackWEB\Prototypes\WordpressPlugIn\WordpressPlugIn\WP SVN\

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Reffered: https://wordpress.org/