Noted That:

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

6. Now, Click on " Active Plugin"

7. Then, See left sidemenu. " If Modified Since " folder is added on left sidemenu. Now, Click on " If Modified Since " folder.

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

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

1. Upload the if-modified-since folder to the /wp-content/plugins/ directory
2. Activate the plugin through the ‘Plugins’ menu in WordPress
3. No need to configure, it just works!