I have been having trouble for weeks trying to update Wordfence, always getting the “Update Failed: The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.” I was starting to get a bit nervous about the outdated protection.
Acting on the above entries (God bless you all!), I simply deleted the file /wp-content/plugins/wordfence/tmp/configCache.php.
Then back to dashboard and tried update again and IT WORKED!
Thanks to all who worked on this.