[KaktoR]

Like error says "duplicate", you have to merge InitializeWizard proceure

And make only one [Code] section, not two. You have to merge them too.

var
  URLText: TNewStaticText;


procedure ShowSplashScreen(p1:HWND;p2:AnsiString;p3,p4,p5,p6,p7:integer;p8:boolean;p9:Cardinal;p10 :integer);
    external 'ShowSplashScreen@files:isgsg.dll stdcall delayload';


procedure URLTextClick(Sender: TObject);
var
  ErrorCode: Integer;
begin
  ShellExec('open', 'http://fileforums.com', '', '', SW_SHOWNORMAL, ewNoWait, ErrorCode);
end;


procedure InitializeWizard();

ExtractTemporaryFile('Splash.png');
  ShowSplashScreen(WizardForm.Handle,ExpandConstant('{tmp}\Splash.png'), 1000, 1000, 1000, 0, 255, True, $FFFFFF, 10);

begin
  URLText := TNewStaticText.Create(WizardForm);
  with URLText do begin
    Parent := WizardForm;
    Left := ScaleX(5);
    Top := ScaleY(327);
    Width := ScaleX(156);
    Height := ScaleY(23);
    Caption := 'URL Text';
    OnClick := @URLTextClick;
  end;
end;