wkral

Solution

Make a backup of wp-admin/includes/file.php
Edit the wp-admin/includes/file.php

replacing line 149
if ( empty( $filename ) || ‘.’ == $filename ) {
with
if ( empty( $filename ) || ‘.’ == $filename || ‘/’ === $filename ) {

which worked for me ??

Hi there, i’ve got the same issue.

Updating WordPress gives me the follow

Update WordPress
Downloading update from https://downloads.www.ads-software.com/release/wordpress-4.2.1-no-content.zip…

Unpacking the update…

Verifying the unpacked files…

Preparing to install the latest version…

Enabling Maintenance mode…

—–

There’s no “.maintenance” file.