Noted That:

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

6. Now, Click on " Active Plugin"

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

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

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

PDF Thumbnails requires ImageMagick with GhostScript support. If you are lucky,
this is already installed on your system, otherwise, installation can be done
with the following steps:

1. Install ghostscript
2. Install imagemagick with ghostscript support
3. Install PHP extension for imagemagick (can use pecl)
4. Restart web server for changes to take effect

Details may differ based on which operating system you are running, see
Support for
more resources and tips on how this can be done in Windows, Linux and OSX.

Debian / Ubuntu

sudo apt-get install ghostscript php5-imagick
sudo service apache2 restart