I assume you are desperate to fix the latest 3 password field duplication issue that updating to WordPress 4.3 has caused? If so, the way to fix is to update to new v3.5.1, which fixes the issue. If you don't want to update, then you still need to copy of the registration template file that holds the new code and then copy the css styles that relate to it. It might be worth you renewing your subscription if you can't get the update.