Hi,
before you do downgrade we strongly recommend for each case to make backup.
Steps:
1. Download WP 4.4.2
2. Delete the wp-config.php file within that package if it exists.
3. Remove the /wp-includes folder and its content.
4. Simply upload all the files and replace the files on your server.
5. Go to login page. You will see a notice about upgrading your Database. Just click the button.
Maybe this video can help you:
https://www.youtube.com/watch?v=OwNR6NVhVFQ
Kind regards