Expandoo expands images when they are clicked, much like a lightbox, but without opening anything new.

Noted That:

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

6. Now, Click on "Active Plugin"

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

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

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

Guide

Guide
Upload the Expandoo plugin to your blog Activate it, and you’re good to go. In the WordPress media uploader, there will be a new option in the “Link to” dropdown named “Expandoo”, select this to activate the plugin for that image as it’s inserted into the editor. Adding the class “.expandoo” to any image will also activate that image for the plugin. The following data attributes can be used to change the default settings. data-maxwidth => sets the width the image will expand to data-parent => set the parent element to fill, accepts any jQuery selector data-speed => sets the animation speed in milliseconds Example:

Upload the Expandoo plugin to your blog
Activate it, and you’re good to go.

In the WordPress media uploader, there will be a new option in the “Link to” dropdown named “Expandoo”, select this to activate the plugin for that image as it’s inserted into the editor.
Adding the class “.expandoo” to any image will also activate that image for the plugin.

The following data attributes can be used to change the default settings.

data-maxwidth => sets the width the image will expand to
data-parent => set the parent element to fill, accepts any jQuery selector
data-speed => sets the animation speed in milliseconds

Example:

lightbox, without, opening, anything, like, much, expands, images, they, clicked,

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Reffered: https://wordpress.org/