I wrote the wrong link in the question.in fact,I downloaded the file for centos6,but they dont contain the subdirectories "GA" and "Updates" together.
I used the oldest package I could that contained both subdirectories mentioned earlier.It was package 1.2.1.
I faced some problems I have mentioned in other thread.(a thread named: "Confirming and registering hosts fails")
I would be glad if you could help me out solving that problem