The Installer application in Mac OS X 10.4 may close without any alert or installation attempt when using certain package files (files whose name ends with ".pkg").
If you can't install a certain package file in Mac OS X 10.4.x, make sure that the software you are attempting to install is compatible with the version of Mac OS X that you are using.
Some installer package files (files whose name ends with ".pkg") are intended for use with Mac OS X 10.5 only. Such package files may cause Installer to "silently quit" without installing, in Mac OS X 10.4.x or earlier.
Note: This issue does not affect installations of Mac OS X 10.5 itself "over" Mac OS X 10.4 or earlier because your Mac will start from the Mac OS X 10.5 disc before installing Leopard.