How should I go about upgrading?

Kadoe Client has been designed so that VKI users can upgrade to the new software straightforwardly. 

When you first download and install Kadoe Client, it runs in a test mode in order to facilitate integration testing.  While Kadoe Client is in test mode, you can continue to run VKI in parallel with it, even on the same computer.  When you are happy with your integration, you can cut over from VKI to Kadoe Client by switching off the test mode and restarting Kadoe Client. 

It is important to do this at the right time.  

There are full instructions under "How and when should I cut over from VKI to Kadoe Client?"