I'm assuming that you are talking about downloading Java for Mac OS X 10.6 Update 7? (Your profile indicates that you are running 10.6.4, but that's probably not correct as 10.6.4 is quite badly outdated. Further, the forum you posted in does not provide any clues as to the system you are actually running.)
Where are you downloading this from? What says it cannot be found? What is the precise error message?