Alpha-1 bug with CC Compat plugin about classic-commerce HOT 2 CLOSED

/**
 * Is WooCommerce Installed
 */
function is_woocommerce_installed() {
	$wp_filesystem = get_filesystem();
	
	if ( ! function_exists( 'is_plugin_active' ) ) {
		include_once ABSPATH . 'wp-admin/includes/plugin.php';
	}
	// Check for conclusive proof that the real WC is installed and not the Classic Commerce compatibility plugin 
	if( $wp_filesystem->exists( WP_PLUGIN_DIR . "/woocommerce/woocommerce.php" ) && $wp_filesystem->exists( WP_PLUGIN_DIR . "/woocommerce/includes/class-woocommerce.php" ) && $wp_filesystem->exists( WP_PLUGIN_DIR . "/woocommerce/includes/admin/class-wc-admin.php" ) ) {
		return true;
	}
	return false;
}
/**
 * Instantiates the WordPress filesystem
 */
function get_filesystem() {
	global $wp_filesystem;
	if ( ! defined( 'FS_METHOD' ) ) {
		define( 'FS_METHOD', 'direct' );
	}
	if ( empty( $wp_filesystem ) ) {
		require_once ABSPATH . '/wp-admin/includes/file.php';
		WP_Filesystem();
	}
	return $wp_filesystem;
}