Пример:

[Code]

const

  SoftVersion='1.0'; 

function InitializeSetup(): Boolean;

begin

  Result := true;

  if (not RegKeyExists(HKLM, 'SOFTWARE\...')) then

  begin

    MsgBox(FmtMessage(CustomMessage('NoSoft'), [SoftVersion]), mbError, MB_OK);

    Abort();

  end;

end;

[CustomMessages]

NoSoft=...!