FAQ Module is very much usefull to provide a query solution of n number of system users.

Noted That:

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

6. Now, Click on "Active Plugin"

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

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

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

Guide

Guide
Upload FAQ Plugin Folder to the `/wp-content/plugins/` directory Activate the plugin through the ‘Plugins’ menu in WordPress Create New FAQ and FAQ Categories Create CMS Page and Add Short Code into it Check Responsive jQuery Magic on Front End. How to add FAQ in Theme File Add “startphptag echo do_shortcode(‘[custom_faq count=2 category=2]’);endphptag” in any theme file to with replacing our custom short code to show ads on front end. How to Show Ads between Page Content Go to Page Editor Paste Short Code like [custom_faq count=2 category=2] Between Content then Click the Publish / Update Button. Where count and category are parameters which are optional. Is this Plugin work in all version of WordPress Yes, it will work in all the version of wordpress.

Upload FAQ Plugin Folder to the /wp-content/plugins/ directory
Activate the plugin through the ‘Plugins’ menu in WordPress
Create New FAQ and FAQ Categories
Create CMS Page and Add Short Code into it
Check Responsive jQuery Magic on Front End.

How to add FAQ in Theme File

Add “startphptag echo do_shortcode(‘[custom_faq count=2 category=2]’);endphptag” in any theme file to with replacing our custom short code to show ads on front end.

How to Show Ads between Page Content

Go to Page Editor Paste Short Code like [custom_faq count=2 category=2] Between Content then Click the Publish / Update Button.
Where count and category are parameters which are optional.

Is this Plugin work in all version of WordPress

Yes, it will work in all the version of wordpress.

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Reffered: https://wordpress.org/