Sargas
As stated in the known issues in the release notes:
"When using the Updater functionality to get the new version of the Intel XDK, if the download takes more than two minutes, you may see a message stating "Cannot download an update since one is not available". Despite the message, the download is still continuing in the background and will complete unless your Internet connection is lost.
Allow ample time for the download to complete, exit the Intel XDK and then restart. If the download completed successfully, you should now see the Install Update icon in the upper right hand corner of the Intel XDK toolbar next to the orange (?) icon."