Computer port must be USB 2.0 or better. USB 1.0 looks like it's working, and will allow a reboot, but downloads will always fail.
Are all dip switches down?
Set all passwords to 111111. One place in the software, 3 places in the touchscreen. If you did a software reset (touchscreen calibration) and "reset password to default", you still need to set the download and upload passwords to 111111. Reset clears them, and does not set them automatically.