Full screen background image in Inno Setup

Question

How to give our setup a background full screen image in Inno Setup compiler.

Like this picture below.

Answer 1

Do not do that. It's against Windows design guidelines.

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Full screen support was dropped in Inno Setup 6.4:
https://jrsoftware.org/files/is6-whatsnew.htm#6.4.0
So the below no longer works.

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Anyway, if you have to (and you are using an old version of Inno Setup), enable legacy full screen installer mode using the WindowVisible=yes directive and then modify the (now visible) background window via MainForm global variable of type TMainForm.

[Setup]
WindowVisible=yes

[Files]
Source: "back.bmp"; Flags: dontcopy

[Code]

procedure InitializeWizard();
var
  BackgroundImage: TBitmapImage;
begin
  BackgroundImage := TBitmapImage.Create(MainForm);
  BackgroundImage.Parent := MainForm;
  BackgroundImage.SetBounds(0, 0, MainForm.ClientWidth, MainForm.ClientHeight);
  BackgroundImage.Stretch := True;
  ExtractTemporaryFile('back.bmp');
  BackgroundImage.Bitmap.LoadFromFile(ExpandConstant('{tmp}\back.bmp'));
end;