I had a previous SR1a which I had obtained from Microsoft but I had unpacked the files and deleted the installer file. Now I want the installer file so I went to your first link and downloaded their file. I went ahead and uncompressed the files from the newly downloaded file and then did a file comparison between my original unpacked files and the new ones. They all checked out fine. Basically I am just concurring that the file downloaded from 4shared.com has the same contents as the original one provided by Microsoft.