All SDK versions prior to 2016 R2 (v10.0.26.0396) have been discontinued and are no longer available for download from Intel websites.
Security issue in web component in SDK versions prior to 2016 R2 (v10.0.26.0396). See this notice for further details and uninstallation instructions.
SDK 2016 R2 (v10.0.26.0396) minus the web component is still downloadable from here. The current version of the SDK, 2016 R3 (v.188.8.131.524) is available for download here.