If you upgrade ImageVault UI via deployment center and the installation does not recognize an existing installation, make sure that the web site hosting the UI has the same name as the ImageVault UI instance.
E.g. if the website is called MyWebsite, the installation will look in C:\ImageVault\UI\MyWebsite for any existing installations. So if you for instance rename the web page, you should rename the phyiscal path to the ImageVault UI as well to be able to upgrade it.