The download for the latest version of Data Lifeguard is here:
http://support.wdc.com/product/download.asp?groupid=613&sid=3&lang=enIf you need to recover data from your RAID array, the best "do-it-yourself" utility to do this is Runtime's RAID Reconstructor:
http://www.runtime.org/raid.htm (which I assume is what dlethe meant when he said "... If, however, you buy the runtime.org software ...." -- but he didn't mention the specific product or provide a link, so I thought I'd clarify that).
The key question here is do you need to recover any data from the array ??
... or are you just trying to test the disks?