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 FTP:=TIdFTP.Create(nil);
 try
  FTP.OnWorkBegin:=FTPOnWorkBegin;
  FTP.OnWork:=FTPOnWork;
  FTP.OnStatus:=FTPOnStatus;
.
.
  FTP.Get(...
.
.
.

procedure TSyncThread.FTPOnWork(Sender: TObject; AWorkMode: TWorkMode; const AWorkCount: Integer);
begin
 if AWorkMode=wmRead then SyncForm.ProgressBar.Position:=SyncForm.ProgressBar.Tag+AWorkCount;
 if bClose then FTP.Abort;
end;					

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 TSyncThread = class(TThread)
  private
  protected
   procedure Execute; override;
   procedure FTPOnWork(Sender: TObject; AWorkMode: TWorkMode; const AWorkCount: Integer);
  end;

var Form1: TForm1; bClose: Boolean=false; FTP: TIdFTP;

implementation

{$R *.dfm}

procedure TSyncThread.Execute;
begin
 FTP:=TIdFTP.Create(nil);
 with FTP do begin
  OnWork:=FTPOnWork;
  Host:='...';
  Username:='...';
  Password:='...';
  Passive:=true;
  Connect;
  ChangeDir('...');
  Get('...','...');
 end;
 FTP.Free;
end;

procedure TSyncThread.FTPOnWork(Sender: TObject; AWorkMode: TWorkMode; const AWorkCount: Integer);
begin
 if bClose then FTP.Abort;
end;

procedure TForm1.Button1Click(Sender: TObject);
var thrFtp: TSyncThread;
begin
 thrFtp:=TSyncThread.Create(true);
 thrFtp.Priority:=tpNormal;
 thrFtp.FreeOnTerminate:=true;
 thrFtp.Resume;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
 bClose:=true;
end;