hi

i've tried downloading the latest silverstripe numerous times from the official download link http://silverstripe.org/assets/downloads/SilverStripe-v2.4.2.tar.gz .In the tar.gz file, there's a .tar file, named silverstripe-v2.4.2.tar. and when I extract the silverstripe-v2.4.2.tar file, I only get these files and folders:

[folder]sapphire
[files] Makefile
[files] favicon.ico

and in the [folder] sapphire, there's these files and folders:
[folder]widgets
[folder]tests
[folder]templates
[folder]search
[folder]lang
[folder]cli
[folder]api
[files]static-main.php
[files]sake
[files]Makefile

and obviously, when I put the folder sapphire into my localhost folder, and tried accessing http://localhost/sapphire/ there's nothing to be seen there. I expect there should be some index.php file or something, right? I've tried downloading from the link above a few times, and the files are the same.....