What is the most stable version of DHIS2 war file implementation that uses visualizer app?
Hi @owenhangs1
Welcome to the community! 
All the latest versions of DHIS2 use the Data Visualizer app. You can find the latest and stable releases in the page: https://releases.dhis2.org/
The Data Visualizer app can be updated in the App Management app:
You can have a quick look around in play.dhis2.org (: