Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Moo Collapsing Categories" folder is added on left sidemenu. Now, Click on "Moo Collapsing Categories" folder.

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

8. Now you configure yourself oR Watch video tutorial below about Moo Collapsing Categories Configurtions and Settings or How to work "Moo Collapsing Categories" in your WordPress site.

After Activated Plugin According to Step-6 then,

1. Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
2. or Direct go to: https://yourdomain/wp-admin/plugins.php
3. Then, Find "Moo Collapsing Categories" Activated Plugin from Plugin List.
4. Then, Click on "Settings" from Plugin that is Moo Collapsing Categories
5. Now, Edit/Add/Config the setting and Click on "Save Changes" button,

IMPORTANT!
Please deactivate before upgrading, then re-activate the plugin.

Unpackage contents to wp-content/plugins/ so that the files are in a
mootools-collapsing-categories/ directory.

Widget installation

Activate the plugin, then simply go the
Presentation > Widgets section and drag over the Moo Collapsing Categories Widget.

Manual installation

Activate the plugin, then insert the following into your template: (probably
in sidebar.php). See the Options section for more information on specifying
options.

echo "
\n";
if (function_exists('collapsCat')) { collapsCat();
} else { wp_get_categories('your_options_here');
}
echo "
\n";