This plugin allows adding a single a widget zone in your contents via shortcode.

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Desire Page Widget" folder is added on left sidemenu. Now, Click on "Desire Page Widget" folder.

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

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

Guide
Upload the Desire Page Widget plugin to your wp-content/plugins/ blog folder, then activate it. Go to appearance/widgets in your admin menu Add a Desire Page Widget in the freshly created Desire Widget Sidebar Select in the list the page you want to display Name to your widget (usually a name related to the page you’re including) Copy and paste the shortcode [desire_widget_sidebar] into the content you want the sidebar to show up, a page or a post for example done! You can use this plugin to create more efficient web pages with the full power of widgets. Thanks to the custom css classes, you can as well create custom based layout pages. Have fun !

Guide

Upload the Desire Page Widget plugin to your wp-content/plugins/ blog folder, then activate it.

Go to appearance/widgets in your admin menu
Add a Desire Page Widget in the freshly created Desire Widget Sidebar
Select in the list the page you want to display
Name to your widget (usually a name related to the page you’re including)
Copy and paste the shortcode [desire_widget_sidebar] into the content you want the sidebar to show up, a page or a post for example

done!

You can use this plugin to create more efficient web pages with the full power of widgets.
Thanks to the custom css classes, you can as well create custom based layout pages.

Have fun !

your, contents, shortcode, zone, widget, allows, adding, single, plugin,

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Reffered: https://wordpress.org/