Lemonberry Page Protect is a simple way to restict page/post content to a list of (non-Wordpress) users.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Lemonberry Page Protect" folder is added on left sidemenu. Now, Click on "Lemonberry Page Protect" folder.

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

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

Guide

Guide
This section describes how to install the plugin and get it working. Upload the `/lb-page-protect/` directory to the `/wp-content/plugins/` directory Activate the plugin through the ‘Plugins’ menu in WordPress Set up users and groups using the WP-Admin->Settings->Page Protect menu Use the shortcode [lbprotect groupname] on any page or post you want to restrict. Change groupname to a group you’ve defined in the admin menu. Note: make sure the shortcode is before the tag (if you have one) in your content. If you don’t, the content before the tag will be visible in when a post category is listed.

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

Upload the /lb-page-protect/ directory to the /wp-content/plugins/ directory
Activate the plugin through the ‘Plugins’ menu in WordPress
Set up users and groups using the WP-Admin->Settings->Page Protect menu
Use the shortcode [lbprotect groupname] on any page or post you want to restrict. Change groupname to a group you’ve defined in the admin menu. Note: make sure the shortcode is before the tag (if you have one) in your content. If you don’t, the content before the tag will be visible in when a post category is listed.

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Reffered: https://wordpress.org/