To download updates to Dexis software you simply have to go to their download site. Unfortunately, it is very difficult to find that site as the URL isn’t necessarily intuitive nor is it easy to find in a google search.
The URL is http://www.dexray.com/downloads/ for dexis downloads.
This brings you to a login screen. Just enter whatever you want to let you through.
UPDATED: 5/11/21 I don’t know when it changed but the new site is https://kavo.com/download-center. You need to then use the search on the left to find Dexis Integrator.