The title transformation plugin adds administration functions to the management of posts, pages, categories and most custom content (ACF Compatible).

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Change Titles Case" folder is added on left sidemenu. Now, Click on "Change Titles Case" folder.

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

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

Guide

Guide
To install, simply add it as you will any plugin. The system will then add a new menu item under settings that can allow you to set the exceptions. e.g. Upload the zip file from wordpress to the `/wp-content/plugins/` directory or from the WordPress.org “Download” button or search for it and push the “Add Now” button. Activate the plugin through the ‘Plugins’ menu in WordPress Goto Settings->Change Titles Case to set the words to keep lower or upper when using Mixed case. Goto any wordpress management page and you should see additions to the drop down for mass edits.

To install, simply add it as you will any plugin. The system will then add a new menu item under settings that can allow you to set the exceptions.

e.g.

Upload the zip file from wordpress to the /wp-content/plugins/ directory or from the WordPress.org “Download” button or search for it and push the “Add Now” button.
Activate the plugin through the ‘Plugins’ menu in WordPress
Goto Settings->Change Titles Case to set the words to keep lower or upper when using Mixed case.
Goto any wordpress management page and you should see additions to the drop down for mass edits.

categories, pages, most, custom, compatible, content, posts, management, plugin, transformation,

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Reffered: https://wordpress.org/