Error uploding blink project

Development Tools IDE 1.x
2

A few tips.

  1. Dont use the windows 10 APP but use the regular full install IDE.
  2. Avoid USB 3.0 ports and stick to USB 2.0 where possible or insert a powered USB 2.0 hub between the USB 3.0 port and the Arduino
  3. Try new USB 2.0 cables as they can go bad easily especially the MICRO versions which may not include a data line and only have power.
  4. Try the board on a different computer to rule out the board or computer.
  5. Remove anything connected to the board in case it uses pins needed for USB connections.
  6. Ensure nothing else is trying to use the COM port such as phone sync software, modems, etc.