Sketch download error

Official Hardware Retired 101
1
  1. The same problem bothers me 3 weeks. Sketch download fail because the port is not response.
    1.1 Same in all my computers, desktop, laptop, tablet. As in All Windows OS, XP, windows 7, windows 8 and windows 10.
    1.2But work fine in my MAC.
  2. Solution. >>>>Too simple!
    Remove board drive version 1.0.5 and replaced with version 1.0.4.
    OK then.
  3. My guess, upgrade of board drive triggers conficts in Serial Port while no one knows why, because you can happen to make it right without any problem.
    So, try to downgrade if you are too frustrated and can not wait for version 1.0.6.
2

Have you tried the updated dfu util with 1.05? Solved my download problems.
"dfu-utils update -> please test if you have upload problems"
http://forum.arduino.cc/index.php?topic=388754.0