Failed auto update on WordPress core and now WooCommerce is broken

Today I found the following message in my backend of a WordPress install (v 4.2.2):

An automated WordPress update has failed to complete – please attempt the update again now.

As I normally do not allow automatic updates (because you never know what they will do to your site), most of my core php programs are not writeable.

This particular install is using WooCommerce. I now find that when I edit a product, I am missing the functionality to select the ‘tabs’ that are normally found under the Product Data box – in fact, the tabs are non-existent. It appears that I can see all the fields, and edit them individually, EXCEPT for the upsells and crosssells.

In searching the forums I’ve found that I can turn off the ‘auto’ updating by adding the following to wp-settings.php:

define( ‘WP_AUTO_UPDATE_CORE’, false );

Now, I have two issues that need to be resolved, and I haven’t a clue:

1) How do I get rid of the failed update message? (There is no .maintenance file present anywhere in the site)

2) How do I get WooCommerce back to where it was yesterday? As far as I can tell this is the only issue.

Thanks