I've just accidentally found the answer, after re-building 8.02 ansi with wxWidgets-2.8.12 so it will work
with a "real" Windows 98se, I found myself staring at the un-install icon and clicked it. On the dialog box I saw
the text "Nullsoft Install System" so I tried the same thing on v1.0 RC2 and soon came across "Inno Setup installer"