Noted That:

• To install correctly this thumbnail-grid.zip .
• Fisrt Download the thumbnail-grid.zip to your computer
• Extract/Open thumbnail-grid.zip to Your Computer.
• Then, Find readme.txt file inside thumbnail-grid.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 Tips Below.

Start the Tips:

1. First Download " thumbnail-grid.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 " thumbnail-grid.zip "  Downloaded plugin from your computer, Where you downloaded thumbnail-grid.zip According to Step – 1 Above then, click on " Install Now"

6. Now, Click on " Active Plugin"

7. Then, See left sidemenu. " Featured Image Thumbnail Grid " folder is added on left sidemenu. Now, Click on " Featured Image Thumbnail Grid " folder.

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

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

Download the Thumbnail Grid Plugin

How to install this plugin

Method 1:
Install this plugin using the built-in plugin installer:
Go to Plugins > Add New.
Under Search, type “Thumbnail Grid”
Click Install Now.
A popup window will ask you to confirm your wish to install the Plugin.
Click Proceed to continue with the installation. The resulting installation screen will list the installation as successful or note any problems during the install.
If successful, click Activate Plugin to activate it, or Return to Plugin Installer for further actions.

Method 2:
Download the plugin. In the WordPress admin panel, click on Plugins. Select Add New to get to the “Install Plugins” page. Click on browse and choose the downloaded file.

Click on the “Install Now” button to install the plugin. Once the plugin is installed, select “Activate Plugin”.

Method 3: (Advanced Users):

Unzip the file. Using FTP, upload the thumbnailgrid folder to the contents/plugins folder in your wordpress directory.