Inno Setup! how to give user a choose to uninstall program when reinstall

[flamkuavos]

function NextButtonClick (...)
begin
if CurPageID = TestPage.ID then begin

if(choose the "uninstall" Radio） ?...? ????????????? {{uninstallexe} doesnot work here}
...

end else begin Result := true end
end;

[kenobewan]

This is not an IIS question. Please refer to the Posting Guidelines.

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