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The latest version of the Meta Box premium extensions is safe to integrate with themes or plugins. There are 2 ways to do that:

Using TGM Activation Class

The TGM Activation Class allows developers declare Meta Box as a dependency for their themes / plugins. To use the class, follow these steps:

  1. Download the TGM Activation Class. Make sure you select “Plugin” for the option “I’m going to use TGMPA in a:”.
  2. Extract the downloaded .zip file and copy the file class-tgm-plugin-activation.php and example.php to your theme / plugin folder. You should rename example.php file to something else for easier understanding.
  3. Open the example.php file and add Meta Box to the plugin list, like this:
require_once get_template_directory() . '/class-tgm-plugin-activation.php';
add_action( 'tgmpa_register', 'prefix_register_required_plugins' );
function prefix_register_required_plugins() {
    $plugins = array(
            'name'     => 'Extension Name', // The plugin name.
            'slug'     => 'extension-slug', // The plugin slug (typically the folder name).
            'source'   => get_stylesheet_directory() . '/plugins/', // The plugin source.
            'required' => true, // If false, the plugin is only 'recommended' instead of required.
    $config = array(
        'id' => 'your-id',
    tgmpa( $plugins, $config );

Remember to change the extension slug and name to the correct slug and name of the extension(s) you want to include. For more information about the syntax, please read TGM Activation Class’s documentation.

Bundling extensions

In order to include the extension directly in your theme or plugin, please follow the following steps:

  1. Copy the plugin folder to your theme/plugin. It doesn’t matter if you put it in the theme root folder or in a subfolder.
  2. Include the extension’s main file by putting the following line into the functions.php of your theme or your plugin’s file:
require get_template_directory() . '/extension-slug/extension-slug.php'; // Path to the extension's main file

Remember to change the extension slug to the correct slug of the extension(s) you want to include.