how to update exe applicatio from internet ?

i am using this procedure to update my application from internet  , But i got problem i already can download the new exe ,, but i wanted to auto replace the old application with the new updated one  i cannot do that while the exe application is running !

the approach that i am trying to achieve is when i run my application and download the update auto restart the application with the new update one  , i don't want to duplicated Files like rename and leave the old version etc  

procedure TForm1.DownLoadNewVersion1Click(Sender: TObject);
var
  apath: string;
  new: Integer;
begin
  // This is the exact code from my application
  apath           := GetPathPath;
  Gauge1.Progress := 0;
  StatusBar1.SimplePanel := True;
  StatusBar1.SimpleText := 'Connecting to http://tsoft.home.ro';
  Gauge1.Progress := 20;
  if DownloadFile('http://www.tsoft.home.ro/update.ini', PChar(apath) + '/update.ini') then
  begin
    Gauge1.Progress := 50;
    StatusBAr1.SimplePanel := True;
    StatusBar1.SimpleText := 'Checking for newer versions...';
    vernfo := TiniFile.Create(GetPathPath + '/update.ini');
    new    := vernfo.ReadInteger('version', 'wsc', 7);
    vernfo.Free;
    if (old = new) then
    begin
      StatusBar1.SimplePanel := True;
      StatusBar1.SimpleText  := 'No new version detected';
      Gauge1.Progress        := 100;
    end
    else if DownloadFile('http://www.tsoft.home.ro/winsafe.exe',
      PChar(apath) + '/winsafe.exe') then
    begin
      ShowMessage('Update succeseful');
      Gauge1.Progress := 100;
      winsc           := TIniFile.Create(ChangeFileExt(Application.ExeName, '.ini'));
      winsc.WriteInteger('wsc', 'vernfo', new);
      winsc.Free;
    end
    else 
      MessageDlg('A new version has appeard but it requires a second install',
        mtInformation, [mbOK], 0);
  end
  else
  begin
    StatusBar1.SimplePanel := True;
    StatusBar1.SimpleText  := 'Failed to connect probably a internet problem';
    Gauge1.Progress        := 0;
  end;
end;

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dolphin KingAsked:
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KimputerConnect With a Mentor Commented:
I suggest you start the update module (separate .exe) to update the main program (have it close the main app if it's still open).
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KimputerCommented:
That's why all major software releases (think Google Chrome, Adobe Reader etc) use a separate update modules. It's just not possible to update yourself.
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dolphin KingAuthor Commented:
so you suggest to create a luncher to the orginal exe that need to be updated ?
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dolphin KingAuthor Commented:
i will take your suggestion as accepted answer how ever i was thinking about something else ...
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Geert GruwezOracle dbaCommented:
Letting an exe update itself doesnt work.
There is always a second app required which can need elevated privs.

You can lift someone except yourself
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dolphin KingAuthor Commented:
yes i was thinking flat . i did secondary app
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