By default implementation, what you are asking it is not possible.
As I said already, by default the web update process uses the URL of the Monitor URL field to download your update information file (URL/updates.ini).
However and as reported by the link I suggested you previously:
You may, of course, customize both the pre-built dialogs and the update script using the Dialog Editor and the script editor. Nothing is hard coded, and even though the base dialogs and update script cover most usage scenarios and work out of the box, they are still fully extensible to suit your own requirements and update scenarios.
In other words, you may customize the pre-built update script as you prefer and eventually, you may also invoke a custom tool (a Dll or Exe) which does any sort of specialized requirement, validation or update scenarios.