manually edit ID
check box is checked.
You should only change the ID if you want to change the identity if your
project. The application ID ensures that later versions of your application
will be able to find and recognize earlier installations.
This generates an installer that can only be installed on top of an installation of a certain installation. An add-on installer doesn't have a separate uninstaller. This is useful to distribute patches and enhancements.
If the add-on installer type is selected, you have to enter an application ID for the base application in the text field below. With the ... chooser button, you can select an install4j project file from your file system, and extract its application ID.