According to the help, the message You must include at least one Application in an UwpAppx build" error during the UwpAppX build using the Desktop Bridge Setup Converter can be solved either with:
- Add your application(s) manually to the Application Details page
or
- Create the shortcut(s) for your application(s); they will be added automatically to your UwpAppX build
In Advanced Installer, from where the MSI I point to in the Converter is created, I did create a shortcut (after realizing that has to be done manually). Of course the MSI contains the application exe (I can install it and run it from a shortcut in Classic Shell menu for example). Not sure how to "add my application manually in the Application Details Page". I assume the "Product Details" page is meant? Well, in Product Version I pointed to the exe (as it says there 1.0.1.0 (retrieved from file: "APPDIR\xxxx.exe").
So why does this error still occur?
Another thing I did not (yet) see: can I change my PackageName? I could change the CN publisher name so maybe this step will follow when I solved the above issue, but if these do not match the current appx the submission will fail I know from experience.