Excalibur is the best and most affordable content monetization software on the market. Easiest plugin to configure with the most features.

Noted That:

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

6. Now, Click on "Active Plugin"

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

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

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

Guide
This section describes how to install the plugin and get it working. In your WordPress dashboard, go to Plugins->Add New and either upload Excalibur (if you’ve already downloaded the plugin), or search for “Excalibur” in WordPress plugins, then simply click “install”. Before you enable Excalibur, you will need to contact us so that we set you up with an account for you to log into the configuration dashboard. Once you are configured, you will be able to add your Site Token ID (found in your Excalibur account) to the Paywall plugin settings. REQUIREMENTS None

Guide

This section describes how to install the plugin and get it working.

In your WordPress dashboard, go to Plugins->Add New and either upload Excalibur (if you’ve already downloaded the plugin), or search for “Excalibur” in WordPress plugins, then simply click “install”.

Before you enable Excalibur, you will need to contact us so that we set you up with an account for you to log into the configuration dashboard. Once you are configured, you will be able to add your Site Token ID (found in your Excalibur account) to the Paywall plugin settings.

REQUIREMENTS
None

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Reffered: https://wordpress.org/