update-plugin.class.php

public function update_state($transient) {
    if (!is_object($transient) || !isset($transient->response)) {
        return $transient;
    }

    $plugin = $this->plugin;

    if (!empty($plugin) && isset($plugin['version']) && version_compare($plugin['version'], TG_VERSION) > 0) {
        $API = new TG_Envato_API();

        $_plugin = [
            'slug'        => dirname($plugin['slug']),
            'new_version' => $plugin['version'],
            'url'         => $plugin['url'],
            'package'     => $API->deferred_download($plugin['id']),
            'name'        => $plugin['name'],
        ];

        $transient->response[$plugin['slug']] = (object)$_plugin;
    } else {
        unset($transient->response['the-grid/the-grid.php']);
    }

    return $transient;
}