Hi,
What you need can be done by
creating a custom dialog in the "Dialogs" page. Please note that the dialog editor can be used only in an Enterprise project. On this custom dialog, you can create the controls you need for getting the information from the user.
After the custom controls are created, you can use the "Property Name" field in their
Properties pane to set the property of each control. These properties will contain the information retrieved from the controls and they can be used for the XML file.
I do not want a custom action during the install phase i want to write into the xml files before that.
I'm afraid that this is not supported by Advanced Installer (it can create an XML only during the install). However, you can try using a
custom action to create the XML file before the installation starts.
Regards,
Cosmin