[BlackSelf]

Raf-9600, скрипт делался на примере скринов, кот. кинул Krekerpro.
Компоненты не указаны, поэтому страницы и нет.
Всё остальное учел:

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Код:

[Setup]
AppName=My Program
AppVerName=My Program 1.5
AppPublisher=My Company, Inc.
DefaultDirName={pf}\My Program
DefaultGroupName=My Program
OutputBaseFilename=setup
Compression=lzma
SolidCompression=yes
WizardSmallImageFile=small.bmp
WizardImageFile=Welcome.bmp

[Languages]
Name: "russian"; MessagesFile: "compiler:Languages\Russian.isl"

[_Сode]
var
  NeedSize:Integer;
  FreeMB, TotalMB: Cardinal;
  NeedSpaceLabel: TLabel;
  n: Integer;
  VolumeName, FileSystemName: String;
  VolumeSerialNo, MaxComponentLength, FileSystemFlags: Longint;
  ListBox: TListBox;
  StartMenuTreeView: TStartMenuFolderTreeView;

procedure GetFreeSpaceCaption(Sender: TObject);            
var
  Path: String;
begin
  Path := ExtractFileDrive(WizardForm.DirEdit.Text);
  GetSpaceOnDisk(Path, True, FreeMB, TotalMB);
  if FreeMB < NeedSize then
  WizardForm.NextButton.Enabled := False else
  WizardForm.NextButton.Enabled := True; end;

procedure GetNeedSpaceCaption;                
begin
  if NeedSize > 1024 then
  NeedSpaceLabel.Caption := 'Требуется места на диске: '+ FloatToStr(round(NeedSize/1024*100)/100) + ' GB' else
  NeedSpaceLabel.Caption := 'Требуется места на диске: '+ IntToStr(NeedSize)+ ' MB';end;
  
const oneMB= 1024*1024;
function GetLogicalDrives: DWord; external 'GetLogicalDrives@kernel32.dll stdcall';
function GetDriveType(nDrive: String): Longint; external 'GetDriveTypeA@kernel32.dll stdcall';
function GetVolumeInformation(PathName,VolumeName: PChar; VolumeNameSize,VolumeSerialNumber,MaxComponentLength,FileSystemFlags: Longint; FileSystemName: PChar; FileSystemNameSize: Longint): Longint; external 'GetVolumeInformationA@kernel32.dll stdcall';
function MessageBox(hWnd: Integer; lpText, lpCaption: String; uType: Cardinal): Integer; external 'MessageBoxA@user32.dll stdcall';

Function ByteOrTB(Bytes: Extended; noMB: Boolean): String; { Перевод числа в значение бт/Кб/Мб/Гб/Тб (до 3х знаков после запятой)}
Begin
if not noMB then Result:= FloatToStr(Int(Bytes)) +' Мб' else
if Bytes < 1024 then Result:= FloatToStr(Int(Bytes)) +' Бт' else
if Bytes/1024 < 1024 then Result:= FloatToStr(round((Bytes/1024)*10)/10) +' Кб' else
If Bytes/oneMB < 1024 then Result:= FloatToStr(round(Bytes/oneMB*100)/100) +' Мб' else
If Bytes/oneMB/1000 < 1024 then Result:= FloatToStr(round(Bytes/oneMB/1024*1000)/1000) +' Гб' else
Result:= FloatToStr(round(Bytes/oneMB/oneMB*1000)/1000) +' Тб'
StringChange(Result, ',', '.')
End;

Function DelSP(String: String): String; { Удаление начальных, конечных и повторных пробелов }
Begin while (Pos(' ', String) > 0) do Delete(String, Pos(' ', String), 1); Result:= Trim(String); End;

Function CutString(String: String; MaxLength: Longint): String; { Обрезать строку до заданного кол-ва символов}
Begin
if Length(String) > MaxLength then Result:= Copy(String, 1, 6) +'...'+ Copy(String, Length(String) - MaxLength +9, MaxLength)
else Result:= String;
End;

Procedure GetDiskInfo(Disk: String);
Begin
FileSystemName:= StringOfChar(' ', 32); VolumeName:= StringOfChar(' ', 256);
GetVolumeInformation(Disk, VolumeName, 255, VolumeSerialNo, MaxComponentLength, FileSystemFlags, FileSystemName, 31);
FileSystemName:= DelSp(FileSystemName); VolumeName:= DelSp(VolumeName); if VolumeName='' then VolumeName:='без метки';
End;

Procedure ListBoxRefresh; var FreeB, TotalB: Cardinal; Path, String: string; Begin
ListBox.Items.Clear
for n:= 1 to 31 do // диск 'А' пропустить
if (GetLogicalDrives and (1 shl n)) > 0 then
if (GetDriveType(Chr(ord('A') + n) +':\') = 2) or (GetDriveType(Chr(ord('A') + n) +':\') = 3) then
if GetSpaceOnDisk(Chr(ord('A') + n) +':\', True, FreeMB, TotalMB) then ListBox.Items.Add(Chr(ord('A') + n) +':');
for n:= 0 to ListBox.Items.Count -1 do begin
Path:= Copy(ListBox.Items[n],1,2) +'\' { если в накопителе нет диска, пропустить обновление }
if GetSpaceOnDisk(Path, False, FreeB, TotalB) and GetSpaceOnDisk(Path, True, FreeMB, TotalMB) then begin GetDiskInfo(Path);
if FreeB >= $7FFFFFFF then String:= PadL(ByteOrTB(FreeMB*oneMB, true),10) else String:= PadL(ByteOrTB(FreeB, true),10);
if TotalB >= $7FFFFFFF then begin TotalB:= TotalMB; FreeB:= FreeMB; String:= PadL(ByteOrTB(TotalMB*oneMB, true),11) +' всего -'+ String end else String:= PadL(ByteOrTB(TotalB, true),11) +' всего| '+ String;
ListBox.Items[n]:= Copy(Path,1,2) + String + PadL(FloatToStr(round(FreeB/TotalB*100)),3)+ '% своб|'+ PadL(FileSystemName,5)+ '| '+ CutString(VolumeName,9); end; end;
End;

Procedure ObjectOnClick(Sender: TObject); Begin
Case TObject(Sender) of
ListBox: for n:= 0 to ListBox.Items.Count-1 do if ListBox.Selected[n] then WizardForm.DirEdit.Text:= Copy(ListBox.Items[n],1,1) +Copy(WizardForm.DirEdit.Text, 2, Length(WizardForm.DirEdit.Text))
StartMenuTreeView: if StartMenuTreeView.Directory <> '' then WizardForm.GroupEdit.Text:= StartMenuTreeView.Directory else WizardForm.GroupEdit.Text:= '{#SetupSetting("DefaultGroupName")}'
WizardForm.NoIconsCheck: begin WizardForm.GroupEdit.Enabled:= not(WizardForm.GroupEdit.Enabled); StartMenuTreeView.Enabled:= WizardForm.GroupEdit.Enabled; WizardForm.GroupBrowseButton.Enabled:= WizardForm.GroupEdit.Enabled end;
end; End;

procedure InitializeWizard();
begin
  NeedSize := 66100;                  //Здесь указывается место для приложения
  WizardForm.DiskSpaceLabel.Hide;
  NeedSpaceLabel := TLabel.Create(WizardForm);
  with NeedSpaceLabel do
  begin
  Parent := WizardForm.SelectDirPage;
  Left := ScaleX(0);
  Top := ScaleY(220);
  Width := ScaleX(209);
  Height := ScaleY(13);
  end;
  ListBox:= TListBox.Create(WizardForm)
  ListBox.SetBounds(WizardForm.DirEdit.Left, WizardForm.DirEdit.Top + WizardForm.DirEdit.Height + 8, WizardForm.DirBrowseButton.Left + WizardForm.DirBrowseButton.Width - WizardForm.DirEdit.Left, WizardForm.DiskSpaceLabel.Top - (WizardForm.DirEdit.Top + WizardForm.DirEdit.Height + 12))
  ListBox.Font.Size:= 9
  ListBox.Font.Style:= []
  ListBox.Font.Name:= 'Courier New';
  ListBox.OnClick:= @ObjectOnClick;
  ListBox.Parent:= WizardForm.SelectDirPage;
  WizardForm.DirEdit.OnChange := @GetFreeSpaceCaption;
  WizardForm.DirEdit.Text := WizardForm.DirEdit.Text + #0;
  end;

procedure CurPageChanged(CurPageID: Integer);
  begin
  if CurPageID=wpSelectDir then
  begin
  GetNeedSpaceCaption;                                               
  if FreeMB < NeedSize then
  WizardForm.NextButton.Enabled:=False
  ListBoxRefresh
  end;
  end;