The most flexible solution for WordPress to age check customers directly on your site!

Noted That:

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

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "AgeChecked for WordPress" folder is added on left sidemenu. Now, Click on "AgeChecked for WordPress" folder.

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

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

Guide

Guide
This section describes how to install and set up the AgeChecked AddOn. Be sure to follow all of the instructions in order for the Add-On to work properly. If you’re unsure of any step, there are screenshots. Requirements Requires at least WordPress 3.9 and PHP 5.5 Steps You’ll need an AgeChecked account Upload the plug-in to your WordPress site. There are three ways to do this: WordPress dashboard search In your WordPress dashboard, go to the Plugins menu and click the Add New button Search for `AgeCheck for WordPress` Click to install the plugin WordPress dashboard upload Download the plug-in zip file by clicking the orange download button on this page In your WordPress dashboard, go to the Plugins menu and click the Add New button Click the Upload link Click the Choose File button to upload the zip file you just downloaded FTP upload Download the plug-in zip file by clicking the orange download button on this page Unzip the file you just downloaded FTP in to your site Upload the `agecheck` folder to the `/wp-content/plugins/` directory Visit the Plugins menu in your WordPress dashboard, find `AgeCheck` in your plug-in list, and click the Activate link. Click on AgeCheck from the admin menu, Here input your AgeChecked account information. Save your settings. On shop visit, the AgeChecked window should pop up asking the user to verify his age. If you need help, try checking the screenshots

This section describes how to install and set up the AgeChecked AddOn. Be sure to follow all of the instructions in order for the Add-On to work properly. If you’re unsure of any step, there are screenshots.

Requirements

Requires at least WordPress 3.9 and PHP 5.5

Steps

You’ll need an AgeChecked account
Upload the plug-in to your WordPress site. There are three ways to do this:
- WordPress dashboard search
  - In your WordPress dashboard, go to the Plugins menu and click the Add New button
  - Search for AgeCheck for WordPress
  - Click to install the plugin
- WordPress dashboard upload
  - Download the plug-in zip file by clicking the orange download button on this page
  - In your WordPress dashboard, go to the Plugins menu and click the Add New button
  - Click the Upload link
  - Click the Choose File button to upload the zip file you just downloaded
- FTP upload
  - Download the plug-in zip file by clicking the orange download button on this page
  - Unzip the file you just downloaded
  - FTP in to your site
  - Upload the agecheck folder to the /wp-content/plugins/ directory
Visit the Plugins menu in your WordPress dashboard, find AgeCheck in your plug-in list, and click the Activate link.
Click on AgeCheck from the admin menu, Here input your AgeChecked account information. Save your settings.
On shop visit, the AgeChecked window should pop up asking the user to verify his age.
If you need help, try checking the screenshots

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Reffered: https://wordpress.org/