Error Insatallation WAS 6.40 ABAP

Hi,

I downloaded 3 times the Sneak Preview NW 04 SP 11 ABAP version from the SAP site.. and every times I had errors while I tried to unzip it...

I used an Download Manager first time.. second time an FTP and then Internet Explorer .. I have every time the same errors, almost all files are invalid or corrupted and also the authenticity for the file in WinRar 3.5 is reported as corrupted... so I don’t know what else to do to solve this problem...

Can someone tell me what's going on? I think the problem is the file on the sap ftp server.

Thank you.