Hi just download the latest version: 1:15pm est 2 June 2010 --Twice! to be sure
This is the message from Winrar:
C:\Users\tisbeme\AppData\Local\Temp\Rar$DI18.2153\SilverStripe-v2.4.0.tar: The archive is corrupt
Winrar stopped so lots of files missing including the Core...