Add FTP settings to wp-config

wp-config.php

<?php
/**
 * FTP Settings
 */
//define('FS_METHOD', 'ftpext');
//define('FTP_BASE', '/path/to/wordpress/');
//define('FTP_CONTENT_DIR', '/path/to/wordpress/wp-content/');
//define('FTP_PLUGIN_DIR ', '/path/to/wordpress/wp-content/plugins/');
//define('FTP_PUBKEY', '/home/username/.ssh/id_rsa.pub');
//define('FTP_PRIKEY', '/home/username/.ssh/id_rsa');
define('FTP_USER', 'username');
define('FTP_PASS', 'password');
define('FTP_HOST', 'ftp.example.com');
define('FTP_SSL', false);
?>

Helps to overcome crappy Windows server permissions or other instances when WordPress can't update/install/delete files. First 6 lines are not needed but included to show full feature set.