If you’ve made your own setup using Wix and Custom Actions, you probably got to the end of your setup to see the progress bar still running with an empty status message. It’s specially notorious if your action takes a long time to run. Gladly, there’s an easy solution to that. Simply open your UI.wxs (or add a <UI> tag in your Product, or in a Fragment) and add the following line:
<ProgressText Action="MyAction">Configuring my Custom Action</ProgressText>
Where MyAction is the Id of your action and that’s it, you now have a proper message on long-running custom actions.