Checking JRE can be done with below code. I found this on the net, but it failed for me with WixUI_FeatureTree and WixUI_Mondo setup interfaces. The problem was that the condition has not checked on install only. Therefore I got the condition message also if I tried to modify features and this blocked me from changing installed features. The added
Installed OR makes sure this condition is only checked on the very first install and not later. It would otherwise cause serious issues for the user if the application should be removed after the JRE has been uninstalled, but your application not before.