The wiki is currently being upgraded
There seems to be a problem with the 4.0.10 package.
After a fresh install of VW I get the above message in admin panel and the version listed is 4.0.9
Running the upgrade script after the installer has completed results in this message:
You have successfully upgraded VaultWiki 4.x.
The VW admin panel now lists 4.0.10 and the XF admin panel still lists 4.0.9