title: What SDK version to download?
body: <p>I need to install Win7 SDK on Win7 amd64 computer. Microsoft download page <a href="http://www.microsoft.com/en-us/download/details.aspx?id=18950" rel="noreferrer">http://www.microsoft.com/en-us/download/details.aspx?id=18950</a> contains 3 iso files: GRMSDK_EN_DVD.iso, GRMSDKIAI_EN_DVD.iso and GRMSDKX_EN_DVD.iso. I wasted a few hours downloading first one, and, of course, got an error message "WinSDK_amd64.msi not found", which means: I need another ISO.</p>
  
  <p>So, which one of these two: GRMSDKIAI_EN_DVD.iso or GRMSDKX_EN_DVD.iso matches my Win7 64 bit computer?</p>